The leatherback sea turtle is the largest of all turtles. These gigantic reptiles can reach up to six feet in length and weigh upwards of 1,200 pounds, dwarfing all other sea turtles. Their name derives from the leathery skin which covers their bodies and forms their shells. This thick, rubbery skin is black in color and unlike the hard, bony carapaces of other turtles. Leatherback sea turtles have an average lifespan of 70-80 years in the wild.