Species of turtles lived 210 million years ago, at the same time as the dinosaurs. However, some species that are alive today are in danger of extinction. For example, a serious threat to marine leatherback turtles is probably all over your home—plastic! When people leave plastic bags, sandwich bags, balloons, and other plastic items on the beach they get swept into the ocean. Clear plastic floating in the water looks a lot like the leatherback's favorite meal—jellyfish. Unsuspecting turtles eat the plastic trash, mistaking it for food. Since it's impossible to digest, plastic's a dangerous diet for any animal!