More Interesting Leatherback Turtles Turtles Vs. A. Sea turtles and their ancestors have been swimming in the oceans for about 75 to 100 million years. They have been around since the time of the dinosaurs. These animals are very long lived and some species survive up to 200 years. Unfortunately, almost all of the world's sea turtles are in danger of extinction.
Sea turtles have different diets, depending on the species.
Green sea turtles are herbivorous, and feed mainly on algae and sea grasses. Hawksbill turtles feed mostly on sponges while Kemp's ridley sea turtle eat crabs and other crustaceans. Leatherbacks, the largest sea turtle, feed primarily on jellyfish. This can cause problems because floating plastic bags are easily mistaken for jellyfish by the turtles, and can cause mortality. Loggerheads eat crabs, jellyfish, and molluscs.