"Leatherback turtles are the oldest, deepest-diving and widest-ranging of all sea turtles, with a lineage that dates back over 100 million years. We can only imagine all that this species has seen and experienced throughout the millennia and yet today they are endangered and face a very uncertain future from human threats such as the harvesting of their eggs and entanglement in fishing gear." —Brian Skerry

Find out more about all seven sea turtle species and the threats they face here.