Appearing out of nowhere, a rogue female wolf tries to kill and eat the pups of a rival pack. Outnumbered and surrounded, the stranger’s assault is pure madness. Will the pack succeed in fighting off this bedraggled intruder?

Jigokudani Monkey Park in Japan is home to a large troop of macaques.

The epaulette shark's small size allows it to thrive in shallow coral reefs. But when the tide rolls out it can be left high and dry.

The male peacock jumping spider (Maratus volans) must dance for his life.

Watching mom is the best way for cheetah cubs to learn how to hunt. She stalks and takes down a ram almost twice her weight, but 'down' doesn't always mean ‘out’ with such a powerful opponent.

On Malilangwe Game Reserve in Zimbabwe a female cheetah has been keeping a secret--she’s the mother of five new cubs.

A cotton line, called a creance, keeps the hawk from flying away.

The goshawk's crouched posture means she's ready for flight.

Size and strength are no match for social intelligence.

Learning to swim is the hardest part...