John Sparks / David Attenborough with mountain gorillas, on location during filming for BBC 'Life on Earth' series in Rwanda 1978

Chadden Hunter / Cameraman Jeff Turner and Producer Chadden Hunter exposed at -40 degrees in Arctic circle in Northern Canada while filming wolves and bison hunting sequence. Taken on location for BBC Frozen Planet se...

Chadden Hunter / Frozen Planet team, training on snow mobiles, Svalbard. Taken on location for BBC Frozen Planet series, 2008

Chadden Hunter / Filming on the Antarctic sea-ice at the edge of a small hole. A cameraman gets a shock when a Killer whale (Orcinus orca) mother and calf explode out of the water in front of his face. Taken on locat...

Kathryn Jeffs / Southern elephant seal pup (Mirounga leonina), Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Rainbow off Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Tracks in snow of Adelie penguins (Pygoscelis adeliae) walking from coast to colony, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Cliff at edge of tabular iceberg, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Camera lens view of the 'Golden Fleece' in the centre of a horseshoe shaped iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Iceberg off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Icebergs off the Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Floe ice off the Antarctic peninsula at dawn, Antarctica, January 2009, Taken on location for BBC Frozen Planet series