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Nature
The Druids are the first wolves reintroduced into Yellowstone National Park.
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Nature
Ernest Thompson Seton's tale about an encounter with a wolf led to the establishment of the National Park system and the Boy Scout movement in America.
Nature
Each time the grizzly and the wolf meet in Yellowstone National Park, one of them has a tactical advantage.
Nature
Grizzly bears cause social and environmental problems at Yellowstone National Park.
Nature
Rangers at Denali National Park in Alaska train hikers for planned encounters with grizzlies; bears fish for salmon.
Nature
Grizzlies, wolves and cougars roam Montana's rugged, pristine Glacier National Park.
Nature
Former Vietnam medic Doug Peacock lives as a fire watcher and conservationist in Montana's Glacier National Park.
Nature
Some 1,700 brown bears take up residence in the Tongass National Forest in southeastern Alaska.
Nature
Bear biologist Chris Morgan tracks grizzlies in the Alaskan wilderness.
Nature
Chris Morgan studies black bears caught between urban development in Anchorage, Alaska, and the wilderness.
Nature
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.
Antarctica: The End of the Earth
Icebergs are the source of life for seals, krill, penguins and petrels.
Nature
Female Adélie penguins lay their eggs on land, head for the sea, leaving males to guard the nests, and return a month later.
Nature
Killer whales snatch sea lion pups from shore, as penguins, maras and guanacos go about their business.
Nature
Millions of years ago, the advance and retreat of ice shaped the mountains, coastlines, gorges and inland waterways of Ireland.