Giant African Bullfrog

The males weigh up to 1.4 kg (3.1 lb) and grow to 24.5 cm (9.6 in) in snout–to–vent length. Females are half the size of males, which is unusual, considering that most female amphibians are (generally) larger than males, to help the amplexus. The dorsum is dark olive-green in adults. Juveniles have bright green coloration with a yellow stripe down the back. The abdomen is white to creamy-yellow with breeding males having yellow forelimbs.

The African bullfrog is a voracious carnivore, eating insects and other invertebrates, small rodents, reptiles, small birds, fish, and other amphibians that can fit in their mouths. It is also a cannibalistic species—the male African bullfrog is known for occasionally eating the tadpoles he guards, and juveniles also eat tadpoles. An African bullfrog kept at the Pretoria Zoo in South Africa once ate 17 juvenile Rinkhals snakes (Hemachatus haemachatus). When exposed to dry conditions, they become dormant and may form a cocoon which covers the entire body surface except the external nostrils. The cocoon significantly decreases the rate of evaporative water loss. When it rains, the water softens the cocoon and the frog crawls out.