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Traces the evolution of cats from their beginnings on the Asian continent to their introduction into the Americas, taking an in-depth look at what makes the family of felines unique and the evolutionary tricks and adaptions that truly make a cat, a cat.

Examines the natural wonders of six continents (including Mount Everest's Khumbu Icefall, the Amazon, the Grand Canyon, Victoria Falls, the Camargue, and ocean reefs), focusing on how the natural features of each locale affects the life and culture of its inhabitants.

Filmmaker Jim Dutcher and his wife Jamie lived with gray wolves for three years to make this documentary, and their work reveals complex social behavior never before captured on film. You'll observe the dominance of the pack's alpha male and the submissiveness of the omega wolf. You'll see the pack initiate new members, and witness the critical moment when the alpha selects a mate. Perhaps most incredible is the bond developed between the wolves and...

What will the world be like when mankind is extinct? The pyramids may stand forever, but the cities will disappear. Our greatest masterpieces will fade and crumble. As global warming and the depletion of natural resources become ever more pressing issues it is critical to consider how we can reduce our impact on the planet. Journey to locations around the globe already going through the processes of a lack of human intervention. See the changes wrought...

There's a reason Africa's most powerful and mysterious river is called the Heart of Darkness. Up to eight miles wide with towering ten-foot waves, the Congo pulses through dangerous terrain and serves as the lifeblood to an incredible variety of species; from forest elephants to elephant fish.

Part of the massive Tongass National Forest, Admiralty Island in Southeast Alaska supports the largest concentration of bears anywhere in the world. Sustained by a wealth of salmon streams, isolated and protected by their environment, some 1,700 Alaskan brown bears are part of a unique circle of life that has played out here for centuries.

Take a walk on the wild side as actor and wildlife enthusiast, Dominic Monaghan, brings his love of the slithering and crawling creatures of your worst nightmares. Monaghan explores the remote corners of the globe in search of some of the most nasty animals in the world. He'll educate the masses on their origins, their unique qualities and why we shouldn't be so quick to squash them on sight.

Part 1, The rise of the dog, examines the relationship between dogs and humans, from their initial domestication to the present day. Part 2, Dogs by design, examines the many different breeds of dogs, and how modern technology is changing the science of dog breeding.

Of all continents on Earth, none preserves a more spectacular story of its origins than Australia. With help from high-energy host and geologist Richard Smith, we meet titanic dinosaurs and giant kangaroos, sea monsters and prehistoric crustaceans, disappearing mountains and deadly asteroids. Epic in scope, intimate in nature, this is the untold story of the Land Down Under, the one island continent that has got it all.

Tour this spectacular state with noted zoologist and anthropologist Jeff Corwin as he searches for whales or watches grizzlies catch their dinner. Episodes include The Kenai Peninsula; Mobile Alaska; Denali National Park and Preserve; and more.