
Nature
A profile of Alaska includes its icy landscape, humpback whales, grizzlies and the northern lights.

A profile of Alaska includes its icy landscape, humpback whales, grizzlies and the northern lights.

The Druids are the first wolves reintroduced into Yellowstone National Park.

In Yellowstone, size and power square off against speed and teamwork: grizzly vs. wolf.

Ecologist Chris Morgan travels to northern Alaska in late fall to see polar bears.

Ecologist Chris Morgan explores the world of black bears.

Ecologist Chris Morgan camps among the largest concentration of grizzles in the world.

The rescue of the grizzly population of Yellowstone and ensuing social problems.

Explore the delicate balance of the interconnected lives of bears, trees, and salmon.

Bird nests come in all shapes and sizes. Each, a work of art, is built to protect.

Horseshoe crab numbers drop as their use as bait by the fishing industry increases.

Wildlife cinematographer Wolfgang Bayer focuses on the Laysan albatross of the Hawaiian Islands.

Follow a wood duck family in this fascinating look at one of our most familiar birds.

Explore the difficulties and consequences of keeping and caring for parrots as pets.

Join a team of scientists on an expedition to find and film the birds of New Guinea.

Florida's Everglades National Park is a protected wilderness where predatory pythons thrive.

Scientists use poisons from animals to create lifesaving drugs.

Amphibians are vanishing in the greatest mass extinction since the dinosaurs.

Scientists teach a gorilla to use sign language to communicate with them narrator Martin Sheen.

Individuals care for a population of once-captive chimpanzees that scientists used for research.

Meet the pioneering group of scientists who transformed our understanding of ecology.