BBC Earth

Episode 4 – Frozen Seas

Preview

A look at the survival techniques of creatures that endure the harsh conditions of the Arctic and Antarctic.

The polar bear is the top predator in the Arctic, catching seals on the ice and forcing seabirds to nest high up on cliffs. While in Antartica, the flightless penguins might have no ground-based predators, but it's in the water that they face the real danger – the constant threat from leopard seals is never far away.