Meanwhile, those with smooth, moist skin and long, strong, webbed hind legs for swimming and jumping are called frogs. In general, frogs live in moist climates and lay their eggs in clusters, while toads live in drier climates and lay their eggs in long chains. For example, there are frogs with warty skin, and toads with slimy skin. Many species fit equally well into both categories. Exploratorium staff frogkeeper Ned McAllister discusses the feeding habits of frogs, toads, and tadpoles.
Spadefoot toads have hard, horn-like growths on their hind feet.
Unlike most animals, spadefoot toads dig backwards. While digging with their hind feet, they move in a backward spiral and gradually disappear into the earth. Frogs eat almost any live prey they can find, including insects, snails, spiders, and worms, or small fish. All prey gets swallowed whole, because frogs can't chew. If they have teeth at all, they are usually only on the upper jaw, used for holding onto prey and not for biting or chewing.