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

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

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus) on ice, Svalbard, Norway

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus) waiting at breathing hole for seals, Svalbard, Norway

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus), Svalbard, Norway

Marion Vollborn/ BIA / Polar Bear (Ursus maritimus), Svalbard, Norway

David Fleetham / Galapagos Sea Lion (Zalophus californianus wollebacki) framed by a school of Black Striped Salema (Xenocys jessiae). Santa Cruz Island, Galapagos Islands, Equador.

Alex Mustard / Giant mottled eel (Anguilla marmorata) in river with villagers washing clothes in background. Ambon, Maluku Archipelago, Indonesia. Banda Sea, tropical west Pacific Ocean.

Heike Odermatt / Walrus (Odobenus rosmarus), Svalbard, Norway

Jordi Chias / Woman snorkeller swimming inside lagoon Toau atoll, Tuamotu Archipelago, French Polynesia, Pacific Ocean.

Claudio Contreras / Prickly pear (Opuntia sp.) growing on coastline, Socorro Island, Revillagigedo Archipelago National Park (Socorro Islands), Pacific Ocean, Western Mexico, November, Honorary Mention in the third natio...

Claudio Contreras / Great Frigatebird (Fregata minor) departing from nest, San Benedicto Island, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Isl...