Extras

Video thumbnail: Nature Maned Lioness Displays Both Male and Female Traits

Nature

Maned Lioness Displays Both Male and Female Traits

An African lioness that looks and acts male may be the secret to her pride's success.

Maned Lioness Displays Both Male and Female Traits

Video thumbnail: Nature The Benefits of Friendship

Nature

The Benefits of Friendship

The social behavior of nonhuman primates and the benefits of friendship.

The Benefits of Friendship

Video thumbnail: Nature Studying the Emotional Lives of Animals

Nature

Studying the Emotional Lives of Animals

Marc Bekoff, featured in Animal Odd Couples, on the scientific study of animal emotions.

Studying the Emotional Lives of Animals

Video thumbnail: Nature The Tortoise and the Goose

Nature

The Tortoise and the Goose

A 45-year-old female Aldabra tortoise was chosen by an unusual suitor: a male Brant goose.

The Tortoise and the Goose

Video thumbnail: Nature Animal Odd Couples Preview

Nature

Animal Odd Couples Preview

It's time to challenge the notion that only humans form lasting friendships.

Animal Odd Couples Preview

Video thumbnail: Nature Kate and Pip

Nature

Kate and Pip

An abandoned fawn is taken in by a Great Dane.

Kate and Pip