Clips from the NATURE episode "Holy Cow!" show the cow's digestive system and illustrate other naturally evolved and artificially selected traits of cattle.

This video-enhanced lesson focuses on how and why humans have been so successful in selectively breeding cattle to suit our needs, while also exploring the limitations and consequences of this success. (Grades 9-12)

The segments from the NATURE episode "Extraordinary Birds" show examples of the adaptations of different birds to their varying environments.

Scientists have uncovered an evolutionary path suggesting that polar bears are a relatively new species.

Experience the bittersweet tale of baby ring-tailed lemurs, including an unusual near-albino infant named Sapphire, learning to survive in their treetop homes.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.

NATURE's six-part series TRIUMPH OF LIFE presents the remarkable story of evolution and its survivors.