Leatherbacks are the largest turtles on Earth ... the longest migrations between breeding and feeding areas of any sea turtle, averaging 3,700 miles each way. After mating at sea, females come ...

One of the most distinctive features of turtles is their shell, which is actually part of their skeleton ... The oldest ...

and the Eastern Pacific green turtle, which has been found in coastal waters from Alaska to Chile. Weighing up to 700 pounds green turtles are among the largest sea turtles in the world.