The area's evolutionary roots opens this look at the African valley.

The wildlife that lives on the Great Rift's ash plains.

Examines the Red Sea, the island of Madagascar and East Africa.

Soft coral, sponges, tubeworms, anemones and giant cod adapt to life in Antarctica's subzero waters.

Profiles the wildlife living within the British crown colony of Hong Kong

An exploration of the Caledonian forest in Scotland, Britain's largest remaining area of ancient woodland.

A portrait of the endangered mountain gorilla in equatorial Africa.

A look at the maneating tigers of the Sundarbans delta in India.

Resource management in Italy's alpine Gran Paradiso National Park has consequences beyond the parks boundaries.

Scientists study sandhill cranes on Nebraskan plains, Alaskan and Siberian coasts and in the Northwest Territories.

The forests and waters of Ethiopia's Bale Mountains, may one day renew the country's depleted landscape.

The relationship between working sheepdogs and flocks of sheep. Selective breeding yields a sheepdog with outstanding abilities to tend the creature other canines prey upon.

Tracing the course of the Colorado River.

Thousands of years of human settlement provide the backdrop by which to discover the wildlife of Ireland.

The fur trade continues to threaten the South American otter with extinction, despite its status as an endangered species.

Profiles the Haida Indians who live on British Columbia's Queen Charlotte Island.

An exploration of the environmental impact of man's attempts to halt the erosion of Presque Isle beaches.

The effect of the 1988 fire on the ecosystem of Yellowstone National Park.

A natural history of the snake includes its significance to man as a symbol of fertility, immortality and death.