David Attenborough presents the first of six new films celebrating 40 years of wildlife film-making by the BBC Natural History Unit. This week a study of the habits of the polar bear during its life on the frozen Arctic ice cap.
Cameras follow these hunters as they crash into the dens of seal pups, swim between ice floes and raise their tiny cubs. See today's choices.
Producer Martha Holmes : Series producer Keith Scholey
Stereo Subtitled
It's a bear's life: page 36