Leatherback Turtle

The Leatherback sea turtles have the widest distribution of all sea turtles. They are the biggest sea turtle on Earth and also one of the oldest species that existed back in the time T. Rex was alive.
Unlike all other sea turtles, the leatherback doesn't possess a hard shell, they have a flexible shell that allows them to dive to great depths.
An interesting facts is that the sex of the hatchlings depends on the temperature of the nest, a higher temperature than 29.5 degrees means there will be more females and from a lower temperature results more males.
The Leatherback turtle is classified as a vulnerable species as a result of polution and because their eggs are being consumed in many Asian countries.