The great mountain ranges are some of the planet's most spectacular landscapes but they are unforgiving places to live in. Only few pioneering animals have what it takes to endure at extreme altitude.

Mountain animals are also among the most elusive in the world, yet this second episode in the Planet Earth II series provides unique and intimate glimpses into their secretive lives. Witness the moment four snow leopards come together when a mother and cub become trapped between two rival males. Join Grizzly bears as they ‘pole-dance' against trees to rub off their winter fur and soar with Golden eagles hunting among Europe's snow-capped peaks.

The world's deserts are lands of extremes, forcing animals to come up with ingenious ways to cope with the hostile conditions and giving rise to the most incredible survival stories on Earth.

A pride of desert lions is so hungry they risk hunting a giraffe several times their size, while male sand grouse fly 120 miles each day to the nearest waterhole and dice with death to collect water for their chicks.

Filmed for the first time, a tiny bat does battle with one of the world's deadliest scorpions. And in Madagascar a locust swarm of biblical proportions is revealed as never before.