Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass, on iceberg. Svalbard, Norway, July 2018.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) colony, males huddling whilst incubating eggs. Atka Bay, Antarctica. July. Winner of the Portfolio category of the Wildlife Photographer of the Year Awards 2019.

Jordi Chias / Crabeater seals (Lobodon carcinophaga) resting on ice floating ice sheet, Antarctic Peninsula, Antarctica.

Jordi Chias / Leopard seal (Hydrurga leptonyx) resting over an iceberg, Antarctic Peninsula, Antarctica.

Jordi Chias / Iceberg, Antarctic Peninsula, Antarctica.

Jordi Chias / Gentoo penguins (Pygoscelis papua) swimming together and porpoising in search of krill, Antarctic Peninsula, Antarctica.

Colin Monteath/ Hedgehog House / Icebergs in winter in lake, Hooker Glacier, Mount Cook, Mount Cook National Park, New Zealand

Stefan Christmann / Sea ice and iceberg during polar night. Atka Bay, Antarctica. July 2017.

Stefan Christmann / Moon rising over sea ice during polar night. Atka Bay, Antarctica. June 2017.

Stefan Christmann / Cameraman Lindsay McCrae on sea ice filming frozen landscape and icebergfor BBC Dynasties Penguin programme. Atka Bay, Antarctica. October 2017.

Stefan Christmann / Cameraman Lindsay McCrae filming Emperor penguin (Aptenodytes forsteri) colony for BBC Dynasties Penguin programme. Chicks are on sea ice whilst parents fish at sea. Atka Bay, Antarctica. December 201...

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) group sliding over sea ice, returning to form breeding colony. Iceberg in background. Atka Bay, Antarctica. April 2017.