PBS Nature schedule

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The importance of the atmosphere and the oceans both in creating and destroying life. Host: George Page. Narrator: James Earl Jones.

The influence the sun and moon have on the seasons and the tides. Host: George Page. Narrator: James Earl Jones.

The varied activity, both human and natural, that occurs on the slopes of active volcanoes.

The 1883 eruption of Krakatau blows open a six-and-a-half mile hole and causes tsunamis killing more than 40,000 people.

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

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.

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

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

An intimate portrayal of motherhood centers on an African wild dog family in the Zimbabwean wilderness.

Researchers and filmmakers set out to produce the first comprehensive film chronicle of the jaguar.

Searching for elusive Siberian tigers in remote Russia.

How the first cats arose in Asia and eventually came to conquer Africa; an in-depth look at lions, servals, caracals, cheetahs, tigers, fishing and sand cats.

Cats in the Americas, including the rise of domestic cats; an in-depth look at the jaguar, urban mountain lion, ocelot, Canada lynx, margay, Siamese cat and the Sphynx.

Cloud, the wild white stallion now in his prime, rules Arrowhead Mountain in Montana.

Cinematographer Wolfgang Bayer compares mustangs with the settling of North America.

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.

How humans saved the wild horse from extinction and how mankind created over four hundred specialized breeds over time.

More than 30 million white-tailed deer live in the U.S.

Hummingbirds, the tiniest of birds, qualify as some of the toughest and most energetic creatures in the world.