Turtles and tortoises are a very old group of reptiles, going back about 220 million years.

UnderWater-Six of the seven types of ocean turtles that swim the planet's waters—leatherback, blockhead, Kemp's ridley, green, olive ridley, and hawksbill—are found in each sea aside from the Arctic and Antarctic. The seventh, the flatback, lives just in the waters around Australia.

The leatherback is the biggest ocean turtle and can gauge an astounding 2,000 pounds. It's likewise the main ocean turtle that doesn't have a hard, hard shell. Its carapace is to some degree adaptable and practically rubbery to the touch. The shells of other ocean turtles are made of thick plates called scutes.Sea turtles make staggeringly long relocations among taking care of and rearing regions. The leatherback ventures a normal of 3,700 miles every way. Ocean turtles mate adrift, then, at that point, come aground on sea shores to lay their eggs. Females delve an opening in the sand, then, at that point, store their grasp of eggs (up to 100, in the leatherback's case), cover it back up, then, at that point, return to the ocean.