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 average loggerhead measures around long when fully grown, although larger specimens of up to have been discovered. The adult loggerhead sea turtle weighs approximately , with the largest specimens weighing in at more than . The skin ranges from yellow to brown in color, and the shell is typically reddish-brown. No external differences in gender are seen until the turtle becomes an adult, the most obvious difference being the adult males have thicker tails and shorter
plastrons than the females.