Heike Odermatt / Walrus (Odobenus rosmarus) on ice floe, Hinlopen Strait, Svalbard, Norway

Heike Odermatt / Walrus (Odobenus rosmarus) on ice floe, Hinlopen Strait, Svalbard, Norway

Heike Odermatt / Walrus (Odobenus rosmarus) on ice floe, Svalbard, Norway

Heike Odermatt / Walrus (Odobenus rosmarus) climbing on ice floe, Svalbard, Norway

Heike Odermatt / Bearded Seal (Erignathus barbatus) on ice floe, Magdalenefjorden, Svalbard, Norway

Thomas Marent / White-tailed Eagle (Haliaeetus albicilla) on ice floe, Rausu, Hokkaido, Japan

Thomas Marent / Steller's Sea Eagle (Haliaeetus pelagicus) group on ice floe, Rausu, Hokkaido, Japan

Colin Monteath / Mount Cook reflection in ice covered Mueller Lake, Mount Cook National Park, Canterbury, New Zealand

Hiroya Minakuchi / Sea ice, Weddell Sea, Antarctic Peninsula, Antarctica

Todd Mintz / Narwhal (Monodon monoceros) pod at surface with one tusk visible, Arctic Bay, Baffin Island, Canada, June

Yva Momatiuk & John Eastcott / Gentoo Penguin (Pygoscelis papua) on small ice floe, Gerlache Passage, Antarctica

Suzi Eszterhas / Adelie Penguin (Pygoscelis adeliae) group jumping off iceberg into icy water, Paulet Island, Antarctica