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"Loggerhead turtle" redirects here. The term may also refer to Loggerhead musk turtle.
The flag of Florida

This animal is the state reptile of Florida.[1][2]

Loggerhead sea turtle
Temporal range: 40–0 Ma Cretaceous - Recent[3]
A loggerhead sea turtle in an aquarium tank swims overhead. The underside is visible.
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Subclass:
Anapsida
Order:
Testudines
Superfamily:
Chelonioidea
Family:
Cheloniidae[5]
Genus:
Caretta

Species:
C. caretta
Binomial name
Caretta caretta
Synonyms
Species synonymy
  • Testudo Caretta
    Linnaeus, 1758
  • Testudo Cephalo
    Schneider, 1783
  • Testudo nasicornis
    Lacépède, 1788
  • Testudo Caouana
    Lacépède, 1788
  • Chelone caretta
    Brongniart, 1805
  • Chelonia Caouanna
    Schweigger, 1812
  • Caretta nasuta
    Rafinesque, 1814
  • Chelonia cavanna
    Oken, 1816
  • Caretta atra
    Merrem, 1820
  • Caretta Cephalo
    Merrem, 1820
  • Caretta nasicornis
    Merrem, 1820
  • Chelonia caretta
    Bory de Saint-Vincent, 1828
  • Testudo Corianna
    Gray, 1831
  • Chelonia pelasgorum
    Valenciennes in Bory de Saint-Vincent, 1833
  • Chelonia cephalo
    Gray, 1829
  • Chelonia (Caretta) cephalo
    Lesson in Bélanger, 1834
  • Chelonia caouanna
    Duméril & Bibron, 1835
  • Chelonia (Thalassochelys) Caouana
    Fitzinger, 1836
  • Chelonia (Thalassochelys) atra
    Fitzinger, 1836
  • Thalassochelys caretta
    Bonaparte, 1838
  • Chelonia (Caouanna) cephalo
    Cocteau in Cocteau & Bibron in Ramon de la Sagra, 1838
  • Halichelys atra
    Fitzinger, 1843
  • Caounana Caretta
    Gray, 1844
  • Caouana elongata
    Gray, 1844
  • Thalassochelys Caouana
    Agassiz, 1857
  • Thalassochelys corticata
    Girard, 1858
  • Chelonia corticata
    Strauch, 1862
  • Thalassochelys elongata
    Strauch, 1862
  • Thalassochelys caouana
    Nardo, 1864
  • Eremonia elongata
    Gray, 1873
  • Caretta caretta
    Stejneger, 1873
  • Thalassochelys cephalo
    Barbour & Cole, 1906
  • Caretta caretta caretta
    Mertens & Muller, 1928
  • Caretta gigas
    Deraniyagala, 1933
  • Caretta caretta gigas
    Deraniyagala, 1939
  • Caretta caretta tarapacana
    Caldwell, 1962
  • Chelonia cahuano
    Tamayo, 1962
  • Caretta careta
    Tamayo, 1962[6]
Genus synonymy
  • Caretta
    Rafinesque, 1814
  • Caretta (Thalassochelys)
    Fitzinger, 1835
  • Thalassochelys
    Bonaparte, 1838
  • Caouana
    Cocteau in Ramon de la Sagra, 1838
  • Halichelys
    Fitzinger, 1843
  • Eremonia
    Gray, 1873
  •  ?Pliochelys
    Portis, 1890
  •  ?Proganosaurus
    Portis, 1890[7]

The loggerhead sea turtle (Caretta caretta), or loggerhead, is an oceanic turtle distributed throughout the world. It is a marine reptile, belonging to the family Cheloniidae. The loggerhead measures up to 213 centimetres (84 in) long when fully grown. The adult loggerhead sea turtle weighs approximately 135 kilograms (298 lb). The skin ranges from yellow to brown in color, and the shell is typically reddish-brown. There are no external differences in gender until the turtle becomes an adult, the most obvious difference being that adult males have thicker tails and shorter plastrons than the females.

The loggerhead sea turtle is found in the Atlantic, Pacific, and Indian oceans as well as the Mediterranean Sea. It spends most of its life in saltwater and estuarine habitats, with females briefly coming ashore to lay eggs. The loggerhead sea turtle has a low reproductive rate; females lay an average of four egg clutches and then become quiescent, producing no eggs for two to three years. The loggerhead reaches sexual maturity within 17–33 years and has a lifespan of 47–67 years.

The loggerhead sea turtle is omnivorous, feeding mainly on bottom dwelling invertebrates. Its large and powerful jaws serve as an effective tool in dismantling its prey. Young loggerheads are exploited by numerous predators; the eggs are especially vulnerable to terrestrial organisms. Once the turtles reach adulthood, their formidable size limits predation to large marine organisms such as sharks.

Loggerheads are considered an endangered species and are protected by the International Union for the Conservation of Nature. Untended fishing gear is responsible for many loggerhead deaths. Turtles may also suffocate if they are trapped in fishing trawls. Turtle excluder devices (TEDs) have been implemented in efforts to reduce mortality by providing the turtle an escape route. Loss of suitable nesting beaches and the introduction of exotic predators has also taken a toll on loggerhead populations. Efforts to restore their numbers will require international cooperation since the turtles roam vast areas of ocean and critical nesting beaches are scattered among several countries.

Taxonomy[edit]

Carolus Linnaeus gave the loggerhead its first binomial name, Testudo caretta, in 1758.[6][8] Thirty-five other names emerged over the following two centuries, with the combination Caretta caretta first introduced in 1902 by Leonhard Stejneger.[7] The English common name "loggerhead" refers to the animal's large head.[9][10] The loggerhead sea turtle belongs to the family Cheloniidae, which includes all sea turtles except the leatherback sea turtle.[11] The subspecific classification of the loggerhead sea turtle is debated, but most authors consider it a single polymorphic species.[12] Molecular genetics has confirmed hybridization of the loggerhead sea turtle with the Kemp's ridley sea turtle, hawksbill sea turtle, and green sea turtles. The extent of natural hybridization is not yet determined; however, second generation hybrids have been reported, suggesting some hybrids are fertile.[13]

Habitat[edit]

Loggerhead sea turtles spend most of their lives in the open ocean and in shallow coastal waters. They rarely come ashore, with the exception of the females' brief visits to construct nests and deposit eggs. Hatchling loggerhead turtles live in floating mats of Sargassum algae.[14] Adults and juveniles live along the continental shelf, as well as in shallow coastal estuaries.[15] In the northwestern Atlantic Ocean, age plays a factor in habitat preference. Juveniles are more frequently found in shallow estuarine habitats with limited ocean access compared to non-nesting adults.[16] Loggerheads occupy waters with surface temperatures ranging from 13.3–28 °C (55.9–82.4 °F) during non-nesting season. Temperatures from 27–28 °C (81–82 °F) are most suitable for nesting females.[17]

Juvenile loggerheads share the Sargassum habitat with a variety of other organisms. The mats of Sargassum contain as many as 100 different species of animals on which the juveniles feed. Some of the prey, such as ants, flies, aphids, leafhoppers, and beetles, are carried by the wind to these areas. Endemic prey of the Sargassum mats include barnacles, small crab larvae, fish eggs, and hydrozoan colonies.[14] Marine mammals and commercial fish, such as tuna, dolphin fish, and amberjacks, also inhabit the Sargassum mats.[18]

Distribution[edit]

A map of the range of a loggerhead sea turtle covering the Atlantic, Pacific, and Indian Oceans, and the Mediterranean Sea
Range of the loggerhead sea turtle

The loggerhead sea turtle has a cosmopolitan distribution, nesting over the broadest geographical range of any sea turtle. The loggerhead inhabits the Atlantic, Indian, and Pacific Oceans and the Mediterranean Sea.[19]

In the Atlantic Ocean, the greatest concentration of loggerheads is along the southeastern coast of North America and in the Gulf of Mexico.[19] Very few loggerheads are found along the European and African coastlines.[20] Florida is the most popular nesting site, with over 67,000 nests built per year.[20] Nesting extends as far north as Virginia, as far south as Brazil, and as far east as the Cape Verde Islands.[20] The Cape Verde Islands are the only significant nesting site on the eastern side of the Atlantic. Loggerheads found in the Atlantic Ocean feed from Canada to Brazil.[19]

In the Indian Ocean, loggerheads feed along the coastlines of Africa, the Arabian Peninsula, and in the Arabian Sea.[21] Along the African coastline, loggerheads nest from Mozambique's Bazaruto Archipelago to South Africa's St Lucia estuary.[22] The largest Indian Ocean nesting site is Oman, on the Arabian Peninsula, which hosts around 15,000 nests, giving it the second largest nesting population of loggerheads in the world. Western Australia is another notable nesting area, with 1,000-2,000 nests per year.[21]

Pacific loggerheads live in temperate to tropical regions.[22] They forage in the East China Sea, the southwestern Pacific, and along the Baja California peninsula. Eastern Australia and Japan are the major nesting areas, with the Great Barrier Reef deemed an important nesting area.[23] Pacific loggerheads occasionally nest in Vanuatu and Tokelau. Yakushima Island is the most important site, with three nesting grounds visited by 40% of all nearby loggerheads.[21] After nesting, females often find homes in the East China Sea, while the Kuroshio Extension Bifurcation region provides important juvenile foraging areas.[22] Eastern Pacific populations are concentrated off the coast of Baja California, where upwelling provides rich feeding grounds for juvenile turtles and subadults (individuals past the juvenile stage that lack adult characteristics). Nesting sites along the eastern Pacific Basin are rare. mtDNA sequence polymorphism analysis and tracking studies suggest 95% of the population along the coast of the Americas hatch on the Japanese Islands in the western Pacific.[24] The turtles are transported by the prevailing currents across the full length of the northern Pacific, one of the longest migration routes of any marine animal.[24] The return journey to the natal beaches in Japan has been long suspected, although the trip would cross unproductive clear water with few feeding opportunities.[25] Evidence of a return journey came from an adult female loggerhead named Adelita, who in 1996, equipped with a satellite tracking device, made the 9,000-mile (14,000 km) trip from Mexico across the Pacific. Adelita was the first animal of any kind ever tracked across an ocean basin.[26]

The Mediterranean Sea is a nursery for juveniles, as well as a common place for adults in the spring and summer months.[20][27] Almost 45% of the Mediterranean juvenile population has migrated from the Atlantic.[20] Loggerheads feed in the Alboran Sea and the Adriatic Sea.[20] Greece is the most popular nesting site along the Mediterranean, with more than 3,000 nests per year.[21] Because of this, Greek authorities do not allow planes to take off or land at night in Zakynthos due to the nesting turtles.[28] In addition to the Greek coast, the coastlines of Cyprus and Turkey are also common nesting sites.[21]

Evolutionary history[edit]

All modern sea turtles probably descended from a single common ancestor during the Cretaceous period; however, evidence of a specific ancestor is lacking.[29] Loggerheads, like all other sea turtles excluding the leatherback sea turtle, are members of the ancient family Cheloniidae. About 40 million years ago, a branch of the Cheloniidae gave rise to loggerhead sea turtle.[3] Of the six species of living Cheloniidae, loggerheads are more closely related to the Kemp's ridley sea turtle, olive ridley sea turtle, and the hawksbill turtle than they are to the flatback turtle and the green turtle.

Around three million years ago, during the Pliocene epoch, Central America emerged from the sea, effectively cutting off currents between the Atlantic and Indo-Pacific Oceans. The rerouting of ocean currents lead to climatic changes as the Earth entered a glacial cycle. Cold water upwelling around the Cape of Good Hope and reduction in water temperature at Cape Horn formed cold water barriers to migrating turtles. The result was a complete isolation of the Atlantic and Pacific populations of loggerheads.[30] During the most recent ice age, the beaches of southeastern North America were too cold for sea turtle eggs. As the Earth began to warm, loggerheads moved farther north, colonizing the northern beaches. Because of this, turtles nesting between North Carolina and northern Florida represent a different genetic population from those in southern Florida.[30]

The distinct populations of loggerheads have unique characteristics and genetic differences. For example, Mediterranean loggerheads are smaller, on average, than Atlantic Ocean loggerheads.[21] North Atlantic and Mediterranean loggerhead sea turtles are descendants of colonizing loggerheads from Tongaland, South Africa. South African loggerhead genes are still present in these populations today.[30]

Anatomy and morphology[edit]

Photo of the carapace of a loggerhead sea turtle.
The carapace of this loggerhead is reddish-brown; five vertebral scutes run down the turtle's midline bordered by five pairs of costal scutes.

The loggerhead sea turtle is the world's largest hard-shelled turtle.[31] Adult loggerheads have an average weight range of 80 to 200 kilograms (180 to 440 lb) and a length range of 70 to 95 centimetres (28 to 37 in).[31] The maximum reported weight is 545 kilograms (1,202 lb) and the maximum carapace length is 213 centimetres (84 in).[31] The head and carapace (upper shell) range from a yellow-orange to a reddish-brown, while the plastron (underside) is typically pale yellow.[32] The turtle's neck and sides are brown on the tops and yellow on the sides and bottom.[9]

The turtle's shell is divided into two sections: carapace and plastron. The carapace is further divided into large plates, or scutes.[32] Typically, there are 11 or 12 pairs of marginal scutes which rim the carapace.[8] Five vertebral scutes run down the carapace's midline, while five pairs of costal scutes border them.[33] The nuchal scute is located at the base of the head.[33] The carapace connects to the plastron by 3 pairs of inframarginal scutes forming the bridge of the shell.[33] The plastron features paired gular, humeral, pectoral, abdominal, femoral, and anal scutes.[8] The shell serves as external armor, although loggerhead sea turtles cannot retract their head or flippers into their shells.[34]

Sexual dimorphism of the loggerhead sea turtle is only apparent in adults. Adult males have longer tails and claws than females. The males' plastrons are shorter than the females', presumably to accommodate the males' larger tails. The carapace of males are wider and less domed than the females, and males typically have wider heads than females.[35] The sex of juveniles and subadults cannot be determined through external anatomy, but can be observed through dissection, laparoscopy (an operation performed on the abdomen), histological examination (cell anatomy), and radioimmunological assays (immune study dealing with radiolabeling).[35]

Lachrymal glands located behind each eye allow the loggerhead to maintain osmotic balance by eliminating the excess salt obtained from ingesting ocean water. On land, the excretion of excess salt gives the false impression that the turtle is crying.[36]

Ecology and behavior[edit]

A loggerhead sea turtle resting under a rock with its eyes open.
A resting loggerhead sea turtle

Loggerhead sea turtles observed in captivity and in the wild are most active during the day. In captivity, the loggerheads' daily activities are divided between swimming and resting on the bottom. While resting, loggerheads spread their forelimbs to about mid-stroke swimming position. They remain motionless with eyes open or half-shut and are easily alerted during this state. At night, captive loggerheads sleep in the same position with their eyes tightly shut and are slow to react.[17] Loggerheads spend up to 85% of their day submerged, with males being the more active divers than females. The average duration of dives is 15–30 minutes, but they can stay submerged for up to four hours.[37] Juvenile loggerheads and adults differ in their swimming methods. Juveniles keep their forelimbs pressed to the side of their carapace and propel themselves by kicking with their hind limbs. As the juveniles mature, their swimming method is progressively replaced with the adults' alternating-limb method. The loggerheads depend entirely on this method of swimming by the time they are one year old.[38]

Water temperature affects the sea turtle's metabolic rate.[17] Lethargy is induced at temperatures between 13 and 15 °C (55 and 59 °F). The loggerhead takes on a floating, cold-stunned posture when temperatures drop to approximately 10 °C (50 °F).[17] However, younger loggerheads are more resistant to cold and do not become stunned until temperatures drop below 9 °C (48 °F). The loggerheads' migration help prevent instances of cold-stunning.[39] Higher water temperatures cause an increase in metabolism and heart rate. A loggerhead's body temperature increases in warmer waters more quickly than it decreases in colder water. The loggerhead sea turtle's critical thermal maximum is currently unknown.[39]

Female-female aggression, being uncommon (especially in marine vertebrates), is common among loggerheads. Ritualized aggression escalates from passive threat displays to combat. This conflict primarily occurs over access to feeding grounds. Escalation typically follows four steps.[40] First, initial contact is stimulated by visual or tactile cues. Second, confrontation occurs, beginning with passive confrontations characterized by wide head-tail circling. They begin aggressive confrontation when one turtle ceases to circle and directly faces the other. Third, sparring occurs with turtles snapping at each other’s jaws. The final stage, separation, is either mutual, with both turtles swimming away in opposite directions, or involves chasing one out of the immediate vicinity.[40] Escalation is determined by several factors, including: hormone levels, energy expenditure, expected outcome, and importance of location. At all stages, an upright tail shows willingness to escalate, while a curled tail shows willingness to submit. Because higher aggression is metabolically costly and potentially debilitating, contact is much more likely to escalate when the conflict is over access to good foraging grounds.[40] Further aggression has also been reported in captive loggerheads. The turtles are seemingly territorial and will fight with other loggerheads and sea turtles of different species.[37]

Predators[edit]

A red fox walking along a fallen tree
The red fox is a predator of loggerhead nests in Australia.

Loggerheads have numerous predators. Egg and nestling predators include oligochaete worms, beetles, fly larvae, ants, parasitoid wasp larvae, flesh flies, crabs, snakes, gulls, crows, opposums, bears, rats, armadillos, honey badgers, skunks, canids, raccoons, cats, hogs, and humans. During their migration from their nest to the sea, hatchlings are preyed on by dipteran larvae, crabs, toads, lizards, snakes, birds, and mammals. In the ocean, predators of the loggerhead juveniles and adults include sharks, other fish, such as parrotfish, moray eels, portunid crabs, gulls, monk seals, and killer whales. Nesting females are attacked by flesh flies, feral dogs, and humans. Salt marsh mosquitoes can also pester nesting females.[41][42]

In Australia, the introduction of the red fox (Vulpes vulpes) by English settlers in the 19th century led to significant reductions in loggerhead sea turtle populations. In one coastal section in eastern Australia during the 1970s, predation of turtle eggs destroyed up to 95% of all clutches laid.[43] Aggressive efforts to destroy foxes in the 1980s and 1990s has reduced this impact; however, it is estimated that it will be the year 2020 before populations will experience complete recovery from such dramatic losses.[44]

Along the southeastern coast of the United States, the raccoon (Procyon lotor) is the most destructive predator of nesting sites. Mortality rates of nearly 100% of all clutches laid in a season have been recorded on some Florida beaches.[43] This is attributed to an increase in raccoon populations, which have flourished in urban environments. Aggressive efforts to protect nesting sites by covering them with wire mesh has significantly reduced the impact of raccoon predation on loggerhead sea turtle eggs.[44] On Bald Head Island, in North Carolina, wire mesh screens are used on every confirmed nest to prevent excavation by resident red foxes (http://www.bhic.org/). A new concern with the steel cage technique is interference with the normal development of the nestlings' magnetic sense due to the use of ferrous wire (http://www.unc.edu/depts/geomag/), which may disrupt the turtles' ability to navigate properly. Efforts are underway to find a nonmagnetic material that will prevent predator's gnawing through the barrier.

Up to 40% of nesting females around the world have wounds believed to come from shark attacks.[42]

Disease and parasites[edit]

Infectious bacteria such as Pseudomonas and Salmonella attack loggerhead hatchlings and eggs. Fungi such as Penicillium infect loggerhead sea turtle nests and cloaca.[42]

Fibropapillomatosis disease threatens loggerheads in the form of the herpes-type virus which causes internal and external tumors. These tumors disrupt essential behaviors and, if on the eyes, cause permanent blindness.[45] Trematodes of the family Spirorchiidae inhabit tissues throughout the body of the loggerhead, including vital organs such as the heart and the brain.[46] Trematode infection can be highly debilitating. For example, inflammatory trematode lesions can cause endocarditis and neurological disease.[46] A nematode, Angiostoma carettae, also infects loggerheads.[47] The nematodes cause histologic lesions in the respiratory tract.[47]

More than 100 species of animals from 13 phyla as well as 37 kinds of algae live on loggerheads' backs.[48] These parasitic organisms, which increase drag, offer no known benefit to the turtle, although it has been suggested that the dulling effect of organisms on shell color improves camouflaging ability.[48]

Feeding[edit]

Translucent moon jelly on black blackground. The jelly contains a solid white mass extending through about 2/3 of its body
An adult Aurelia jellyfish which loggerheads eat during migration through the open sea

The loggerhead sea turtle is omnivorous, feeding mainly on bottom dwelling invertebrates, such as gastropods, bivalves, and decapods. The loggerhead has a greater list of known prey than any other sea turtle. Other food items include sponges, corals, sea pens, polychaete worms, sea anemones, cephalopods, barnacles, brachiopods, isopods, insects, bryozoans, sea urchins, sand dollars, sea cucumbers, starfish, fish (eggs, juveniles, and adults), wrasses, hatchling turtles (including members of its own species), algae, and vascular plants.[49] During migration through the open sea, loggerheads eat jellyfish, floating molluscs, floating egg clusters, squid, and flying fish.[9]

Loggerheads crush prey with their large and powerful jaws.[9][41] Projecting scale points on the anterior margin of the forelimbs allow manipulation of the food. These points can be used as "pseudo-claws" to tear large pieces of food in the loggerhead's mouth. The loggerhead will turn its neck sideways to consume the torn food on the scale points.[41] Inward pointing, mucosal (mucus-covered) papillae found in the foreregion of the loggerhead's esophagus filter out foreign bodies, such as fish hooks. The next region of the esophagus is nonpapillated, with numerous mucosal folds. The rate of digestion in loggerheads is temperature dependent; digestion rate increases as temperature increases.[41]

Life history[edit]

Early life[edit]

Loggerhead hatchling crawling through the sand.
A hatchling loggerhead sea turtle on its journey to the ocean

Hatchlings range in color from light brown to almost black, lacking the adult's distinct yellows and reds.[32] Upon hatching, they measure approximately 4.6 centimetres (1.8 in) and weigh about 20 grams (0.71 oz).[9] The eggs are typically laid on the beach in an area above the high-tide line. The eggs are laid near the water so the hatchlings can return to the sea.[50] The loggerhead's sex is dictated by the temperature of the underground nest. Incubation temperatures generally range from 26–32 °C (79–90 °F). Studies show loggerhead sea turtle eggs kept at a constant incubating temperature of 32 °C (90 °F) become females. Eggs incubating at 28 °C (82 °F) become males. An incubation temperature of 30 °C (86 °F) results in an equal ratio of male to female hatchlings.[51] Hatchlings from eggs in the middle of the clutch tend to be the largest, grow the fastest, and be the most active during the first few days of sea life.[43]

After incubating for approximately 80 days, hatchlings dig through the sand to the surface. This usually occurs at night, when darkness increases the chance of escaping predation and damage from extreme sand surface temperatures is reduced.[50] Hatchlings enter the ocean by navigating toward the brighter horizon created by the reflection of the moon and star light off the water's surface.[52]

Hatchlings can lose up to 20% of their body mass due to evaporation of water as they journey from nest to ocean.[53] Hatchlings initially use the undertow to push them five to ten yards away from the shore.[53] Once in the ocean, hatchlings swim for about 20 hours, bringing them far offshore.[32] An iron compound, magnetite, in their brains allows the turtles to perceive the Earth's magnetic field,[54] for navigation. Many hatchlings use Sargassum in the open ocean as protection until they reach 45 centimetres (18 in).[32] Hatchling loggerheads live in this pelagic environment until they reach juvenile age, and then they migrate to nearshore waters.[32]

Maturation[edit]

Photo of a loggerhead swimming above a reef.
A mature loggerhead sea turtle

When ocean waters cool, loggerheads must migrate to warmer areas or hibernate to some degree. In the coldest months, loggerheads submerge for up to seven hours at a time, emerging for only seven minutes to breathe. Although outdone by freshwater turtles, these are among the longest recorded dives for any air-breathing marine vertebrate.[55] During their seasonal migration, juvenile loggerheads have the ability to use both magnetic and visual cues.[56] When both aids are available, they are used in conjunction; if one aid is not available, the other suffices.[56] The turtles swim at about 1.6 kilometres per hour (0.44 m/s) during migration.[57]

Like all marine turtles, the loggerhead prepares for reproduction in its foraging area. This takes place several years before the loggerhead migrates to a mating area.[58] Female loggerheads first reproduce at ages 28–33 in Southeastern United States and Australia, and at ages 17–30 in South Africa. Age at first reproduction in the Mediterranean, Oman, Japan, and Brazil are unknown.[59] Nesting loggerheads have a straight carapace length of 70–109 centimetres (28–43 in). Because of the large range, carapace length is not a reliable indicator of sexual maturity.[58] Loggerheads have an estimated maximum lifespan of 47–67 years in the wild.[49]

Reproduction[edit]

A female loggerhead sea turtle from the back, laying eggs into the hole it has dug
A loggerhead sea turtle laying eggs

Female loggerheads first reproduce between the ages of 17 and 33,[59] and their mating period lasts up to six weeks.[60] They court their mates, however these behaviors have not been thoroughly examined.[61] Male forms of courtship behavior include nuzzling, biting, and head and flipper movements.[61] Studies suggest females produce cloacal pheromones to indicate reproductive ability.[61] Before mating, the male approaches a female and attempts to mount her, while she resists. Next, the male and female begin to circle each other. If the male has competitors, the female may let the males struggle with each other. The winner then mounts the female; the male's curved claws usually damage the shoulders of the female's shell during this process. Other courting males bite the male while he is attempting to copulate, damaging his flippers and tail, possibly exposing bones. Such damage can cause the male to dismount and may require weeks to heal.[61] While nesting, females produce an average of 3.9 egg clutches, and then become quiescent, producing no eggs for an average of two to three years.[60][62] Unlike other sea turtles, courtship and mating usually do not take place near the nesting beach, but rather along migration routes between feeding and breeding grounds.[61] Recent evidence indicates ovulation in loggerheads is mating-induced.[63] Through the act of mating, the female ovulates eggs which are fertilized by the male. This is unique, as mating-induced ovulation is rare outside of mammals.[63] In the Mediterranean, loggerheads mate from late March to early June. The nesting season peaks in June and July, but varies by nesting beach.[64]

Loggerheads may display multiple paternity.[65] Multiple paternity is possible due to sperm storage. The female can store sperm from multiple males in her oviducts until ovulation.[66] A single clutch may have as many as five fathers, each contributing sperm to a portion of the clutch.[65] Multiple paternity and female size are positively correlated.[65] Two hypotheses explain this correlation. One states that males favor large females due to perceived higher fecundity (ability to reproduce).[65] The other states that because larger females are able to swim more quickly to mating grounds, they have a longer mating period.[65]

All sea turtles have similar basic nesting behaviors. Females return to lay eggs at intervals of 12–17 days during the nesting season, on or near the beach where they hatched.[62][67] They exit the water, climb the beach, and scrape away the surface sand to form a body pit. With their hind limbs, they excavate an egg chamber in which the eggs are deposited. The females then cover the egg chamber and body pit with sand, and finally return to the sea.[68] This process takes one to two hours, and occurs in open sand areas or on top of sand dunes.[62] The nesting area must be selected carefully because it affects characteristics such as fitness, emergence ratio, and vulnerability to nest predators.[50] Loggerheads have an average clutch size of 4 eggs.[69]

Conservation[edit]

Loggerhead sea turtles were once intensively hunted for their meat and eggs; consumption has decreased, however, due to worldwide legislation. Despite this, turtle meat and eggs are still consumed in countries where regulations are not strictly enforced.[70] In Mexico, turtle eggs are a common meal; locals claim the egg is an aphrodisiac.[71] Eating turtle eggs or meat can cause serious illness due to harmful bacteria, such as Pseudomonas aeruginosa and Serratia marcescens, and high levels of toxic metals that build up through bioaccumulation.[70][72]

Threats[edit]

An orange diamond sign with the words "Loggerhead Turtle Nesting Area" is blocking off a roped-off area on the beach where a loggerhead has laid eggs.
Loggerhead sea turtle nest roped off as part of the Sea Turtle Protection Project on Hilton Head Island

Many human activities have negative effects on loggerhead sea turtle populations. The prolonged time required for loggerheads to reach sexual maturity and the high mortality rates of eggs and young turtles from natural phenomena compound the problems of population reduction as a consequence of human activities.[73]

The U.S. West Coast is a critical migratory corridor for the Pacific loggerheads, in which these turtles swim across the Pacific to California’s coast from breeding grounds in Japan. Important foraging habitats for juveniles in the central North Pacific have been revealed through telemetry studies.[74] Along with these foraging habitats, high levels of bycatch from industrial-scale fisheries have been found to overlap; with drift gillnets in the past and longline fisheries presently.[74] Many juvenile loggerheads aggregate off the coast of Baja California Sur, Mexico, where small coastal fisheries (6-8m) increase these turtle’s mortality risk; fishers have reported catching dozens of loggerheads with bottom-set gear per day per boat.[74] The most common commercial fishery that accidentally take loggerheads are bottom trawls used for shrimp vessels in the Gulf of California; as well as gillnets, longlines, etc.[75] In 2000, between 2,600 and 6,000 loggerheads were estimated to have been killed by pelagic longlining in the Pacific.[76]

Fishing gear is the biggest threat to loggerheads in the open ocean. They often become entangled in longlines or gillnets. According to the 2009 status review of loggerheads by the Fisheries Service, drowning from entanglement in longline and gillnet fishing gear is the turtles’ primary threat in the North Pacific.[75] They also become stuck in traps, pots, trawls, and dredges.[9] Caught in this unattended equipment, loggerheads risk serious injury or drowning. Turtle excluder devices for nets and other traps reduce the number being accidentally caught.

Nearly 24,000 metric tons of plastic is dumped into the ocean each year. Turtles ingest a wide array of this floating debris, including plastic bags, plastic sheets, plastic pellets, balloons and abandoned fishing line.[77] Loggerheads may mistake the floating plastic for jellyfish, a common food item. The ingested plastic causes numerous health concerns, including: intestinal blockage, reduced nutrient absorption, suffocation, ulcerations, malnutrition or starvation. Ingested plastics release toxic compounds, including polychlorinated biphenyls, which may accumulate in internal tissues. Such toxins may lead to a thinning of eggshells, tissue damage or deviation from natural behaviors.[78]

Artificial lighting discourages nesting and interferes with the hatchlings' ability to navigate to the water's edge. Females prefer nesting on beaches free of artificial lighting. On developed beaches, nests are often clustered around tall buildings, perhaps because they block out the man-made light sources.[58] Loggerhead hatchlings are drawn toward the brighter area over the water which is the consequence of the reflection of moon and star light. Confused by the brighter artificial light, they navigate inland, away from the protective waters, which exposes them to dehydration and predation as the sun rises.[52] Artificial lighting causes tens of thousands of hatchling deaths per year.[79]

Destruction and encroachment of habitat by humans is another threat to loggerhead sea turtles. Optimum nesting beaches are open sand beaches above the high tide line. However, beach development deprives them of suitable nesting areas, forcing them to nest closer to the surf.[62] Urbanization often leads to the siltation of sandy beaches, decreasing their viability.[62] Construction of docks and marinas can destroy near-shore habitats. Boat traffic and dredging degrades habitat and can also injure or kill turtles when boats collide with turtles at or near the surface.[45]

Annual variations in climatic temperatures can affect sex ratios, since loggerheads have temperature-dependent sex determination. High sand temperatures may skew gender ratios in favor of females. In one study (Mrosovsky, N. & Provancha, J. 1992), nesting sites exposed to unseasonably warm temperatures over a three-year period produced 87-99% females. This raises concerns over the connection between rapid global temperature changes and the possibility of population extinction.[80] A more localized effect on gender skewing comes from the construction of tall buildings, which reduce sun exposure, lowering the average sand temperature. This results in a shift in gender ratios that favor the emergence of male turtles.[62]

Conservation efforts[edit]

A loggerhead sea turtle escapes a circular fisherman's net via a TED.
Loggerhead sea turtle escapes from fishing net through a turtle excluder device (TED)

Since the loggerhead occupies such a broad range, successful conservation requires efforts from multiple countries.[9]

Loggerhead sea turtles are classified as endangered by the International Union for the Conservation of Nature and are listed under Appendix I of the Convention on International Trade in Endangered Species, making international trade illegal.[9] In the United States, the U.S. Fish and Wildlife Service (FWS) and National Marine Fisheries Service (NMFS) classify them as a threatened species under the Endangered Species Act.[9] Loggerheads are listed as endangered under both Australia's Environment Protection and Biodiversity Conservation Act 1999 and Queensland's Nature Conservation Act 1992. The Convention on Migratory Species works for the conservation of loggerhead sea turtles on the Atlantic coast of Africa, as well as in the Indian Ocean and southeast Asia.[81][82] Throughout Japan, the Sea Turtle Association of Japan aids in the conservation of loggerhead sea turtles.[83] Greece's ARCHELON works for their conservation.[84] The Marine Research Foundation works for loggerhead conservation in Oman.[85] Annex 2 of the Specially Protected Areas and Wildlife (SPAW) Protocol of the Cartagena Convention, which deals with pollution that could harm marine ecosystems, also protects them.[9][86] Conservation organizations worldwide have worked with the shrimp trawling industry to develop TEDs to exclude even the largest turtles. These devices are mandatory for all shrimp trawlers.[9]


In many places during the nesting season, workers and volunteers search the coastline for nests,[87] and researchers may also go out during the evening to look for nesting females for tagging studies, gather barnacles, and tissues samples. Volunteers may, if necessary, relocate the nests for protection from threats, such as high spring tides and predators, and monitor the nests daily for disturbances. After the eggs hatch, volunteers uncover and tally hatched eggs, undeveloped eggs, and dead hatchlings. Any remaining live hatchlings are released or taken to research facilities. Typically, those that lack the vitality to hatch and climb to the surface die.[88] Hatchlings use the journey from nest to ocean to build strength for the coming swim. Helping them to reach the ocean bypasses this strength building exercise and lowers their chances of survival.[88]

Symbol[edit]

The loggerhead sea turtle is the official state reptile of South Carolina and also the state saltwater reptile of Florida.[1][2]

See also[edit]

References[edit]

Footnotes
  1. ^ a b "State symbols/Fla. cracker horse/loggerhead turtle (SB 230)". Florida House of Representatives. 2008. Retrieved March 6, 2011.
  2. ^ a b Shearer 1994, p. 323
  3. ^ a b Spotila 2004, p. 59 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  4. ^ Casale, P.; Tucker, A.D. (2017). "Caretta caretta (amended version of 2015 assessment)". IUCN Red List of Threatened Species. 2017: e.T3897A119333622. doi:10.2305/IUCN.UK.2017-2.RLTS.T3897A119333622.en. Retrieved 27 October 2020.
  5. ^ Seaturtles: Cheloniidae – Loggerhead Turtle (Caretta caretta): Species Accounts animals.jrank.org
  6. ^ a b Dodd 1988, p. 1 harvnb error: multiple targets (2×): CITEREFDodd1988 (help)
  7. ^ a b Dodd 1988, p. 2 harvnb error: multiple targets (2×): CITEREFDodd1988 (help)
  8. ^ a b c Conant 2009, p. 7 harvnb error: multiple targets (2×): CITEREFConant2009 (help)
  9. ^ a b c d e f g h i j k Bolten, A.B. (2003). "Loggerhead Turtle (Caretta caretta)". NOAA Fisheries. Archived from the original on May 27, 2010. Retrieved January 31, 2010.
  10. ^ Dodd 1988, p. 4 harvnb error: multiple targets (2×): CITEREFDodd1988 (help)
  11. ^ Wynne 1999, p. 97
  12. ^ Marquez 1990, p. 14
  13. ^ James 2004, p. 581 harvnb error: multiple targets (2×): CITEREFJames2004 (help)
  14. ^ a b Spotila 2004, p. 172 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  15. ^ Spotila 2004, p. 174 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  16. ^ Conant 2009, p. 11 harvnb error: multiple targets (2×): CITEREFConant2009 (help)
  17. ^ a b c d Ernst 2009, p. 39
  18. ^ Ross, Steve (2009). "Sargassum: A Complex 'Island' Community at Sea". NOAA. Archived from the original on May 27, 2010. Retrieved May 27, 2010.
  19. ^ a b c Spotila 2004, p. 164 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  20. ^ a b c d e f Spotila 2004, p. 165 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  21. ^ a b c d e f Spotila 2004, p. 166 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  22. ^ a b c Conant 2009, p. 8 harvnb error: multiple targets (2×): CITEREFConant2009 (help)
  23. ^ C.Michael Hogan. 2011. Coral Sea. Encyclopedia of Earth. Eds. P.Saundry & C.J.Cleveland. National Council for Science and the Environment. Washington DC
  24. ^ a b Bowen 1995, p. 3731
  25. ^ Bowen 1995, p. 3733
  26. ^ Wallace J., Nichols (2008). "Voyage of the Lonely Turtle – Interview: Wallace J. Nichols". PBS. Educational Broadcasting Corporation. Archived from the original on 2010-05-29. Retrieved 2010-05-30.
  27. ^ Conant 2009, p. 20 harvnb error: multiple targets (2×): CITEREFConant2009 (help)
  28. ^ "Zakynthos Airport". Zakynthos Internet Services. 2010. Archived from the original on May 27, 2010. Retrieved April 12, 2010. Night flights are banned on Zakynthos, so as not to disturb the endangered Caretta Carettaturtles which nest their eggs on the beaches of Zante.
  29. ^ Witherington 2006, p. 12 harvnb error: multiple targets (2×): CITEREFWitherington2006 (help)
  30. ^ a b c Spotila 2004, p. 167 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  31. ^ a b c Ernst 2009, p. 37
  32. ^ a b c d e f Wynne 1999, p. 104
  33. ^ a b c Wynne 1999, p. 110
  34. ^ SeaWorld Parks & Entertainment (2010). "Sea Turtles: Physical Characteristics". SeaWorld/Busch Gardens Animals. Archived from the original on May 27, 2010. Retrieved 2010-05-26. A sea turtle cannot retract its limbs under its shell as a land turtle can.
  35. ^ a b Valente 2007, p. 22 harvnb error: multiple targets (2×): CITEREFValente2007 (help)
  36. ^ Peaker 1975, p. 231
  37. ^ a b Ernst 2009, p. 44
  38. ^ Ernst 2009, p. 43
  39. ^ a b Ernst 2009, p. 40
  40. ^ a b c Schofield, G; Katselidis, Gail; Pantis, KA; Dimopoulos, JD; Hays, P (2007). "Female-female aggressions: structure of interaction and outcome in loggerhead sea turtles". Marine Ecology Progress Series. 336 (1). Inter-Research: 267. Bibcode:2007MEPS..336..267S. doi:10.3354/meps336267. ISSN 1616-1599. Archived from the original on May 28, 2010. Retrieved May 28, 2010. {{cite journal}}: |first6= missing |last6= (help)
  41. ^ a b c d Ernst 2009, p. 52
  42. ^ a b c Ernst 2009, p. 53
  43. ^ a b c Spotila 2004, p. 171 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  44. ^ a b National Research Council 1990, p. 62
  45. ^ a b NOAA Fisheries (2010). "Threats to Marine Turtles". Endangered marine animal preservation. NOAA Fisheries Office of Protected Resources. Archived from the original on May 27, 2010. Retrieved February 7, 2010.
  46. ^ a b Flint, Mark (November 2009). "Postmortem diagnostic investigation of disease in free-ranging marine turtle populations: a review of common pathologic findings and protocols". Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc. 21 (6). Journal of Veterinary Diagnostic Investigation: 733–759. doi:10.1177/104063870902100601. PMID 19901275. S2CID 17896270. Archived from the original on May 27, 2010. Retrieved May 27, 2010.
  47. ^ a b Manire, Charles (March 2008). "Lungworm infection in three loggerhead sea turtles, Caretta caretta". Journal of Zoo and Wildlife Medicine : Official Publication of the American Association of Zoo Veterinarians. 39 (1). Journal of Zoo and Wildlife Medicine: 92–98. doi:10.1638/2007-0092.1. PMID 18432101. S2CID 2599545. (subscription required)
  48. ^ a b Spotila 2004, p. 177 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  49. ^ a b Ernst 2009, p. 50
  50. ^ a b c Miller 2000, p. 10
  51. ^ Yntema 1982, p. 1013
  52. ^ a b Fish and Wildlife Research Institute (September 2009). "Artificial Lighting and Sea Turtle Hatchling Behavior". Florida Fish and Wildlife Conservation Commission. Coastal Carolina University. Archived from the original on May 27, 2010. Retrieved April 12, 2010.
  53. ^ a b Spotila 2004, p. 21 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  54. ^ Spotila 2004, p. 22 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  55. ^ Hochscheid, Sandra; Bentivegna, Flegra; Hays, Graeme C. (2005). "First Records of Dive Durations for a Hibernating Sea Turtle". Biol. Lett. 1 (1): 82–6. doi:10.1098/rsbl.2004.0250. PMC 1629053. PMID 17148134. Archived from the original on May 27, 2010. Retrieved April 12, 2010.{{cite journal}}: CS1 maint: date and year (link)
  56. ^ a b Avens, Larisa (2003). "Use of multiple orientation cues by juvenile loggerhead sea turtles Caretta caretta". The Journal of Experimental Biology. 206 (1). The Company of Biologists: 4317–4325. doi:10.1242/jeb.00657. PMID 14581601. S2CID 11326992.
  57. ^ The relationship between loggerhead turtle (Caretta caretta) movement patterns and Mediterranean currents, BENTIVEGNA F. (1) ; VALENTINO F. (1) ; FALCO P. (2) ; ZAMBIANCHI E. (2) ; HOCHSCHEID S. (1) ; Marine biology, 2007, vol. 151, no5, pp. 1605–1614 [10 page(s) (article)] (1 p.1/4)
  58. ^ a b c Miller 2000, p. 5
  59. ^ a b Spotila 2004, p. 16 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  60. ^ a b Miller 2000, p. 4
  61. ^ a b c d e Miller 2000, p. 6
  62. ^ a b c d e f Spotila 2004, p. 170 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  63. ^ a b Manire, Charles (2008). "Mating-induced ovulation in loggerhead sea turtles, Caretta caretta". Zoo Biology. 27 (3): 213–225. doi:10.1002/zoo.20171. PMID 19360619. (subscription required)
  64. ^ Miller 2000, p. 9
  65. ^ a b c d e Zbinden, Judith (September 2007). "High frequency of multiple paternity in the largest rookery of Mediterranean loggerhead sea turtles". Molecular Ecology. 16 (17): 3703–3711. doi:10.1111/j.1365-294X.2007.03426.x. PMID 17845442. S2CID 10168400. (subscription required)
  66. ^ Pearce, D.E. (2001). "Turtle Behavior Systems: Behavior, Sperm Storage, and Genetic Paternity". The Journal of Heredity. Archived from the original on May 27, 2010. Retrieved April 29, 2010.
  67. ^ Miller 2000, p. 29
  68. ^ Miller 2000, p. 13
  69. ^ Miller 2000, p. 17
  70. ^ a b Aguirre, A. Alonso; Gardner, Susan C.; Marsh, Jesse C.; Delgado, Stephen G.; Limpus, Colin J.; Nichols, Wallace J. (September 2006). "Hazards Associated with the Consumption of Sea Turtle Meat and Eggs: A Review for Health Care Workers and the General Public" (PDF). EcoHealth. 3 (3): 141–53. doi:10.1007/s10393-006-0032-x. S2CID 26439580. Retrieved 2010-03-02.
  71. ^ Dellios, Hugh (September 18, 2005). "Mexico Cracks Open Myth of Sea Turtle Eggs". Chicago Tribune. Archived from the original on May 27, 2010. Retrieved March 16, 2010.
  72. ^ Craven, Kathryn; Taylor, Judy (September 11, 2007). "Marine Turtle Newsletter: Identification of Bacterial Isolates from Unhatched Loggerhead (Caretta caretta) Sea Turtle Eggs in Georgia, USA". Armstrong Atlantic State University, Dept. Biology. Archived from the original on May 28, 2010. Retrieved March 16, 2010.
  73. ^ Spotila 2004, p. 178 harvnb error: multiple targets (2×): CITEREFSpotila2004 (help)
  74. ^ a b c Peckham, S. Hoyt; Diaz, David Maldanado; Walli, Andreas; Ruiz, Georgita; Crowder, Larry B.; Nichols, Wallace J. (October 2007). Allen, Colin (ed.). "Small-Scale Fisheries Bycatch Jeopardizes Endangered Pacific Loggerhead Turtles". PLOS ONE. 2 (10): e1041. Bibcode:2007PLoSO...2.1041P. doi:10.1371/journal.pone.0001041. PMC 2002513. PMID 17940605.{{cite journal}}: CS1 maint: date and year (link)
  75. ^ a b National Marine Fisheries 1998, p. 23
  76. ^ Peckham, S. Hoyt; Diaz, David Maldonado; Walli, Andreas; Ruiz, Georgita; Crowder, Larry B.; Nichols, Wallace J. (2007). Allen, Colin (ed.). "Small-Scale Fisheries Bycatch Jeopardizes Endangered Pacific Loggerhead Turtles". PLOS ONE. 2 (10): e1041. Bibcode:2007PLoSO...2.1041P. doi:10.1371/journal.pone.0001041. PMC 2002513. PMID 17940605.
  77. ^ National Research Council 1990, p. 114
  78. ^ National Research Council 1990, p. 115
  79. ^ Lorne 2007, p. 23
  80. ^ Janzen 1994, p. 7489 harvnb error: multiple targets (2×): CITEREFJanzen1994 (help)
  81. ^ Convention on Migratory Species (2004). "Memorandum of Understanding concerning Conservation Measures for Marine Turtles of the Atlantic Coast of Africa". Convention on Migratory Species. UNEP / CMS Secretariat. Archived from the original on May 27, 2010. Retrieved 2010-05-26. The project aims to create a monitoring and protection network for nesting and feeding sites in close collaboration with local communities, fishermen, travel operators and coastal developers.
  82. ^ Convention on Migratory Species (2004). "Memorandum of Understanding concerning Conservation Measures for Marine Turtles of the Indian Ocean and South-East Asia". Convention on Migratory Species. UNEP / CMS Secretariat. Archived from the original on May 28, 2010. Retrieved 2010-05-26. In the context of sustainable development, the conservation and management of marine turtles globally and within the Indian Ocean – South-East Asian region presents a formidable challenge.
  83. ^ Bullock, Dusty (2008). "What is the Sea Turtle Association of Japan?". Sea Turtle Association of Japan. Archived from the original on May 27, 2010. Retrieved 2010-05-26. Our most important activities are counting nesting turtles, and marking them to enable discrimination, using consistent methods throughout Japan.
  84. ^ Rees, Alan (2005). "Archelon, the Sea Turtle Protection Society of Greece: 21 Years Studying and Protecting Sea Turtles". Archelon. British Chelonia Group. Archived from the original on May 30, 2010. Retrieved 2010-05-27. Archelon is involved with the turtles, not only through nest management and turtle rehabilitation, but also with stakeholders
  85. ^ Marine Research Foundation (2004). "Ongoing Conservation Initiatives". Marine Research Foundation. Archived from the original on May 30, 2010. Retrieved 2010-05-29. This project aimed to continue to build on Oman's programme to conduct surveys, develop survey protocols and provide equipment and material and personnel support for Government rangers
  86. ^ European Environment Agency (2010). "Legislative instrument details: Cartagena Convention". European Environment Agency. Archived from the original on May 31, 2010. Retrieved 2010-05-31. The Cartagena Convention requires Parties to adopt measures aimed at preventing, reducing and controlling pollution of the following areas: pollution from ships; pollution caused by dumping; pollution from sea-bed activities; airborne pollution; and pollution from land-based sources and activities.
  87. ^ seaturtle.org (2009-12-11). "Job Board". seaturtle.org. Archived from the original on May 28, 2010. Retrieved 2010-05-27. collect biopsy samples for DNA studies, cage nests to prevent egg depredation, record location of nests and non-nesting emergences.
  88. ^ a b Conant 2009, p. 13 harvnb error: multiple targets (2×): CITEREFConant2009 (help)
Bibliography
  • Shearer, Benjamin F.; Shearer, Barbara S. (1994). State names, seals, flags, and symbols (2nd ed.). Westport, Connecticut: Greenwood Publishing Group. ISBN 0-313-28862-3.

Further reading[edit]

  • Bolten, Alan B.; Witherington, Blair E. (2003). Loggerhead Sea Turtles. Washington, D.C.: Smithsonian Books. ISBN 1-58834-136-4.
  • Lutz, Peter L.; Musick, John A.; Wyneken, Jeanette (1997). The Biology of Sea Turtles. Vol. 1. Boca Raton, Florida: CRC Press. ISBN 0-8493-8422-2.
  • Lutz, Peter L.; Musick, John A.; Wyneken, Jeanette (2003). The Biology of Sea Turtles. Vol. 2. Boca Raton, Florida: CRC Press. ISBN 0-8493-8422-2.
  • Gulko, D.; Eckert, K.L. (2004). Sea Turtles: An Ecological Guide. Honolulu, Hawai’i: Mutual Publishing. ISBN 1-56647-651-8.

External links[edit]

Wikispecies has information related to Caretta caretta.
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Category:Caretta Category:Reptiles of Australia Category:Reptiles of Western Australia Category:Fauna of Cuba Category:Reptiles of Guatemala Category:Reptiles of Honduras Category:Reptiles of Japan Category:Reptiles of Mexico Category:Reptiles of Nicaragua Sea Turtle, Loggerhead Sea Turtle, Loggerhead Category:Endangered fauna of Australia Category:EPBC Act endangered biota Category:Nature Conservation Act endangered biota Category:Animals described in 1758 Category:Reptiles of Costa Rica Category:Reptiles of Panama

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