The African Bullfrog is the largest amphibian found in southern Africa. The males average 23 cm (9 inches) and weigh 1.4 kg (3.1 lb) but can easily exceed 2 kg (4.4 lb). The female are half the size of the males. Males are olive in color, with yellow to orange on the throat region. Females are olive to light brown with cream to white throat areas. Both sexes have ridges running laterally on the dorsal surface. They have a spade-like metatarsal tubercle on each hind foot to aid in digging. During the dry season the frogs live underground.