Nile monitors can grow longer than five feet. They eat pretty much anything, judging from a list of their prey from the Florida Fish and Wildlife Conservation Commission: “crabs, crayfish, mussels, snails, slugs, termites, caterpillars, beetles, spiders, grasshoppers and crickets, fish, frogs, toads, lizards, turtles, snakes, young crocodiles, and other reptiles, birds and their eggs, and small mammals.”