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Two species of Rana are common in America and Europe, viz., "Rana esculenta" and "Rana temporaria". The latter alone is indigenous to Great Britain, and varieties of it extend throughout temperate Europe and Asia to Japan, and one variety ("pretiosa") exists in the United States. The edible Frog ("Rana esculenta"), however, has been introduced into England. An Indian species ("Rana breviceps") and several South African species burrow in the ground.
ECOLOGY AND HABITS. The skin of Frogs is usually smooth and free from warts or horny excrescences. It is invested with a colorless epidermis, which is shed from time to time as the creature grows; this splits along the back and thighs, is worked over the head like the taking off of a shirt, and usually eaten by the wearer. The deeper layers contain much pigment, in cells which are more or less under muscular control, enabling Frogs to change their hue to conform to the background.