Odd and bizarre creatures adapt well to their way of life.
A journalist returns to Central and South America to check on the progress of a sloth that she helped reintroduce back into the wild.
Killer whales flock to the Arctic during the summer months, attracted to the huge hunting grounds made possible by the expanses of open water.
Every summer, thousands of gentoo penguins surround a post office on the Antarctic Peninsula.
Cameras, X-rays and ultramicroscopes reveal details about the life of owls, including how they hunt, how their vision and hearing work and how they fly so quietly.
Efforts to save the wild orangutans of Northern Sumatra.
Birds collect, compete for, reject and steal materials for building their nests.
The building plans of beavers, tortoises, hummingbirds and woodrats provide insight into their consciousness, creativity and innovation.
For some animals, living in huge colonies of their own kind provides a secure and rewarding housing arrangement.
A family of Yunnan snub-nosed monkeys living in the Himalayas depends on strong defensive strategies and the interdependence of each member.
Young animals all around the world attempt to hone their survival skills as they prepare to leave home.