Information about the eucalyptus leaf-eating marsupial Phascolarctos cinereus.

Learn about this threatened bird, endemic to southern Iraq's marshlands.

Unlike other carnivores, spotted hyenas have a complex social system with clans of up to 90 individuals. This requires a great deal of social intelligence.

Guereza monkeys have a specialized stomach with two different regions, similar to a cow’s stomach, which helps them digest their leafy diet.

Blue wildebeest females and their young form herds of anywhere from 10 to 1,000 individuals. Young males form bachelor groups, but most adult males are solitary.

The ears of bat-eared foxes can grow up to 5.3 inches long. For an animal that stands 11.8-15.7 inches at the shoulder, that’s enormous.

The naked mole-rat, which is in fact neither a mole nor a rat, is one of only two "eusocial" mammals; as with social insects such as bees and ants, young are produced by only one female in a colony -- the queen.

The slender bodies of red foxes are designed for speed and agility. They can be found in almost the entire northern hemisphere, in part because of their diverse diet.

Giant kangaroo rats bound across California grasslands with their elongated hind legs and feet. They live alone in underground burrows on sandy slopes.