Doug Allan / Emperor penguin males incubating eggs huddle for warmth at -40 degrees centigrade, winter, Antarctica. Green is excrement on snow. {Aptenodytes forsteri}

Doug Allan / Emperor penguin {Aptenodytes forsteri} males huddle for warmth in minus 40 degrees centigrade while incubating eggs in winter, Antarctica Winter extreme cold survival birds seabirds nesting-behaviour

Theo Bosboom / Sand patterns at sunrise, Praia da Adraga, Sintra, Portugal. December 2016

Luis Quinta / Great shearwater (Puffinus gravis) in flight, Fonte da Telha Beach, Portugal, October.

Luis Quinta / Great shearwater (Puffinus gravis) on ocean, near the Fonte da Telha Beach, Portugal, October.

Doug Perrine / Mediterranean monk seal (Monachus monachus) adult male swimming, Deserta Grande, Ilhas Desertas, Parque Natural da Madeira, Portugal, Atlantic Ocean, June. Critically endangered species

Michel Roggo / Underwater river scene with freshwater plants and Tetra fish, Aquario Natural, Rio Baia Bonito, Bonito area, Serra da Bodoquena (Bodoquena Mountain Range), Mato Grosso del Sul, Brazil November/Decembe...

Franco Banfi / Freshwater Dorado (Salminus brasiliensis) Recanto Ecologico, Rio da Prata, Bonito, Mato Grosso do Sul, Brazil

Angelo Gandolfi / Scorched vegetation and rocks after fires during the peak of the dry season, Vale de Lua, Chapada dos Veadeiros National Park, Cerrado region, Goias, Brazil. Fires at the peak of the dry season, Septe...

Mark Carwardine / Amazonian manatee {Trichechus inunguis} calf being fed by hand, Endangered, Captive, Instituto Nacional de Pesquisas da Amazonas, Manaus, Brazil

Doug Allan / Killer Whales (Orcinus orca) spy-hopping to observe Weddell Seal (Leptonychotes weddellii) in preparation to knock it from the ice by creating a wave. Marguerite Bay, Antarctic Peninsula, summer. Free...

Doug Allan / Killer Whales (Orcinus orca) create bow wave to knock Weddell Seal (Leptonychotes weddellii) from the ice; a co-operative hunting strategy. Marguerite Bay, Antarctic Peninsula, summer. Freeze Frame bo...