Episode 1

A team from the Natural History Unit is living cheek by jowl with Africa's big cats. For ten weeks one film-maker will follow a pride of lions - the Marsh pride - another will trail Amber the cheetah and her cubs, and a third will seek out the elusive leopard, Shadow.This is a season of intense activity in the Masai Mara - the great migration is under way. Constantly on the move seeking out fresh pasture, a million or more wildebeest and zebra must run the gauntlet past hungry predators.