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 / Filming Southern Type B Killer whales (Orcinus orca) in Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) on ice floe, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) on ice floe, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice floe and to intimidate, Antarctica. Taken on location for BBC Froz...

Kathryn Jeffs / Southern Type B Killer whales (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) using coordinated wave washing technique, Antarctica. Taken on location for BBC Frozen Planet series, Januar...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli) spyhopping to assess where seal is on ice, whilst Humpback whale (Megaptera novaeangliae) surfaces nearby, Ant...

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

Kathryn Jeffs / Dr Robert (Bob) Pitman and Dr John Durban, scientific advisors, watching for Killer whales (Orcinus orca) on board the 'Golden Fleece', off Antarctic Peninsula, Antarctica, January 2009, Taken on loca...

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) hunting Weddell seal (Leptonychotes weddelli), Antarctica. Taken on location for BBC Frozen Planet series, January

Kathryn Jeffs / Southern Type B Killer whale (Orcinus orca) spyhops to see if Crabeater seals (Lobodon carcinophagus) are potential prey, Antarctica. Taken on location for BBC Frozen Planet series, January 2009

Kathryn Jeffs / Sun low in the sky over floe ice near the Antarctic peninsula, Antactica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / 'Golden Fleece' (base ship of the BBC film crew) as it passes through floe ice off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Coastal landscape off the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / The 'Golden Fleece' (base ship for BBC film crew) passing up the coast of the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / The 'Golden Fleece' (base ship for BBC film crew) passing up the coast of the Antarctic Peninsula, Antarctica, January 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Red spider mites under a rock, the only invertebrates to be found on Antarctica, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Inside abandoned research station on Detaille Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Abandoned research station on Detaille Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Floe ice off coast of Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / The Glden Fleece, base ship for BBC film crew, off Ambers island, US base, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) adult pecking off piece of ice, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) adult pecking off piece of ice, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Antarctic fur seal (Arctocephalus gazella) pup fast asleep on beach, Antarctica, February, Taken on location for BBC Frozen Planet series

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

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

Kathryn Jeffs / Wildlife Cameraman, John Aitchison, on location, filming Adelie penguins, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) chick nearly fledged with last of down feathers but yet to show adults eye ring, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) chick nearly fledged with last of down feathers but yet to show adults eye ring, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / US research base at Palmer station, Ambers island, Antarctic Peninsula, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) chick nearly fledged with last of down feathers but yet to show adults eye ring, Fish Island, Antarctica, February, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / US scientists surveying Adelie penguin colony, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Wildlife Cameraman, John Aitchison, on location, Antarctica. Taken on location for BBC Frozen Planet, February 2009

Kathryn Jeffs / Icebergs off Fish Island, 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 / Adelie penguin (Pygoscelis adeliae) large group on coast, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) large group on coast, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguin (Pygoscelis adeliae) large group on coast, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Compacted snow on slope of iceberg, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Adelie penguins (Pygoscelis adeliae) heading back to colony from the sea, Fish Island, Antarctica, February 2009, Taken on location for BBC Frozen Planet series

Kathryn Jeffs / Floe ice forced up with pressure from more ice, Antarctica, February, Taken on location for BBC Frozen Planet series