PBS Nature schedule

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Wolfgang Bayer captures the winter solitude of Yellowstone National Park.

Footage of the 1988 Yellowstone blaze and its aftermath shows possible causes and results of the fire.

Global changes affect the wilderness of the Yosemite Valley in the Sierra Nevada mountains of Northern California.

An evocative exploration of a wild and little-known landscape in the heartland of North America; featuring new animal behavior, the film pairs blue-chip wildlife sequences with human characters working together to save remaining wild grasslands.

Eagles, pumas, sandhill cranes and other creatures seek sustenance from the Colorado River and its environs.

How wildlife and animal life survive in a severe landscape with temperatures well above 115 degrees.

Undisturbed the saguaro cactus can grow to 60 feet, weigh 10 tons and live 150 years.

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

See how a man's mission to kill a wolf had a lasting impact on wilderness preservation.

Each time the grizzly and the wolf meet in Yellowstone National Park, one of them has a tactical advantage.

Grizzly bears cause social and environmental problems at Yellowstone National Park.

Rangers at Denali National Park in Alaska train hikers for planned encounters with grizzlies; bears fish for salmon.

Grizzlies, wolves and cougars roam Montana's rugged, pristine Glacier National Park.

Former Vietnam medic Doug Peacock lives as a fire watcher and conservationist in Montana's Glacier National Park.

Some 1,700 brown bears take up residence in the Tongass National Forest in southeastern Alaska.

Bear biologist Chris Morgan tracks grizzlies in the Alaskan wilderness.

Chris Morgan studies black bears caught between urban development in Anchorage, Alaska, and the wilderness.

As winter approaches, polar bears wait to hunt on sea ice in Kaktovik, Alaska; in late spring, grizzlies await caribou on the northern slope of Alaska's Brooks Range.

Icebergs are the source of life for seals, krill, penguins and petrels.

Female Adélie penguins lay their eggs on land, head for the sea, leaving males to guard the nests, and return a month later.

Killer whales snatch sea lion pups from shore, as penguins, maras and guanacos go about their business.

Millions of years ago, the advance and retreat of ice shaped the mountains, coastlines, gorges and inland waterways of Ireland.

Emmy-winning filmmaker Hugh Miles presents a lyrical portrait of Scotland's Caledonian Forest.

A bearded vulture, the bonebreaker, feeds atop the harsh Pyrenees separating Spain and France.

Discovering what makes humans and horses so perfect for each other And how the wild horses that were tamed 6,000 years ago became over 400 specialized breeds.

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