Remote islands offer sanctuary; pygmy three-toed sloth resides on a Caribbean island; nesting albatross thrive in isolation.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

From the jungles of Brazil to Costa Rica, animals face life in the most competitive place on Earth.

The hostile conditions of Earth's desert regions give rise to the most incredible survival stories on Earth.

Grasslands cover one quarter of all land and support the vast gatherings of wildlife, but to survive here animals must endure hostile seasonal changes. From Asia's bizarre looking saiga antelope, to the giant ant-eaters of Brazil, grassland animals have adapted in extraordinary ways to cope with these extremes. In the flooded Okavango, lions take on formidable buffalo in epic battles and on the Savannah, bee-eaters take advantage of elephants to help catch insects.

Cities serve as places of surprising opportunity for animals to thrive.