Patrick Morris

They are a living laboratory, a geological conveyor belt that has given birth to and seen the death of may species of plants and animals. Nowhere else on the Earth are the twin processes of creation and extinction of species so apparent.

Our film begins in high summer in Hudson Bay in Canada's Far North, where polar bears have learned to ambush beluga whales, which visit warm river estuaries to breed. It's a crucial time window, at a difficult time of year. In the vast swathes of tundra, a pair of Arctic foxes gather and bury snow geese eggs, and hunt the chicks, for their fast-growing pups. And in Canada's Bay of Fundy, which has the most extreme tides on Earth, vast flocks of semi-palmated...