Portal:Turtles

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Turtles

Loggerhead sea turtle

Turtles are reptiles characterised by a special bony or cartilaginous shell developed from their ribs that acts as a shield. The earliest known turtles date from 157 million years ago. Turtles are ectotherms—they vary their internal temperature according to the ambient environment (commonly known as cold-bloodedness). However, leatherback sea turtles have noticeably higher body temperature than surrounding water because of their high metabolic rate. Though turtles live in and around water, they breathe air and lay eggs on land.

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Loggerhead sea turtle
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 measurers up to 213 centimeters (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.

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  • ... that the oldest known turtle is the 220 million year-old Odontochelys, a prehistoric turtle with teeth and possessing only half a shell?

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Eastern box turtle.jpg
Credit: Matt Reinbold

An Eastern box turtle (Terrapene carolina carolina)

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