[AS.] A small vertebrate animal, with a broad, squat body without a tail, that lives both on land and water. It has a smooth, slimy skin of a greenish-brown or reddish color ; it has teeth on the upper jaw, and by this is distinguished from the toad, which has no teeth. Its tongue is soft and fleshy, and fixed on the front of the mouth, but free behind, so that it can rollout and catch an insect. The tip of the tongue is always covered with a treacly, glutinous matter, to which any insect caught adheres. The frog flings its food down its throat with a very rapid motion. As with the rabbit, its fore limbs are less used than the hind limbs, and so are shorter and smaller. The hind legs are long, and support the swimming web. It has four fingers in front and five toes behind. Frogs breathe slowly, and their blood is of a low temperature. The food of frogs is insects, snails, worms, and they swallow their food whole. Frogs cannot breathe in water, and so live much on land ; but water is needed to keep their bodies moist. They lay their eggs at the bottom of the water. The eggs are laid in a kind of jelly, which fastens them to a stick or plant in the water. After about a month the eggs hatch, when there appear small tadpoles, with head and tail and a pair of shoulders behind the mouth, and with gills for breathing. As they grow the gills and tails are lost and the fiog develops. Of frogs, the tree-frog, the pond frog, and the bull-frog are the most familiar. Frogs are found all over the world, and are eaten as food in many places.