Most turtles are omnivores, but the diet of a turtle is widely depending on the species of turtle. Some turtles eat mollusks, insects, and small fish. Others eat only sea grasses and algae. Snapping turtles are carnivores, and their tongue is similar to a worm where it wiggles to attract fish. Once the fish swims up to the tongue, the turtle snaps its jaws shut. The snapping turtle will also eat plants, frogs, snakes, clams, and other turtles.