The saga of Africa's great wildebeest migration continues. Before they reach the fertile lands of the Serengeti, they must cross the predator-filled waters of the Mara and Sand Rivers.

In the wild, every breath you take may be your last. This compelling program focuses on the life-or-death struggle to survive in the Serengeti, Kalahari, Waza, and Kruger and Corbett National Parks.

Emmy Award-winner John Hurt narrates world-renowned wildlife filmmaker Frederic LePage's breathtaking chronicle of one of nature's most awe-inspiring migrations, as hundreds of thousands of wildebeests and zebras embark on their treacherous trek toward the Masai Mara in Kenya.

From Australia's Great Barrier Reef to Florida's Everglades, follow the lives of the world's most remarkable creatures, including koalas, alligators, crocodiles, black bulls, polar bears, grizzly bears, marine iguanas, leopard sharks, and white stallions.

The natural world can be a difficult and hostile place, especially where vulnerable young are concerned. This fascinating program captures mesmerizing footage of how animals find mates and try to protect their young from disease, predators, and hostile environments.

From burning desert to freezing polar ice, from high above the earth to deep below in the depths of the sea, animals have managed to colonize every inch of the globe. Witness how animals struggle to survive in the harshest environments, the many amazing ways in which they find food, and how they try to keep from becoming food themselves.

From burning desert to freezing polar ice, from high above the earth to deep below in the depths of the sea, animals have managed to colonize every inch of the globe. Witness how animals struggle to survive in the harshest environments, the many amazing ways in which they find food, and how they try to keep from becoming food themselves.