A study of mass migrations from one pole to the other. During the Arctic spring, a mother polar bear and her cubs leave their winter den and move across the frozen sea before it melts.
Mountains, and the creatures which survive on their rough terrain.
The descent of rivers from their mountain sources to the sea.
Features, among others, the Cave of Swallows in Mexico and Deer Cave in Borneo.
A look at the animals which inhabit the planet's deserts, and how they manage to survive there.
Exploring the frozen worlds of the Arctic and Antarctic.
David Attenborough
Narrator
Alastair Fothergill
Director
Producer
Writer
