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

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

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

Sven Zacek / Low angle shot of Ural owl (Strix uralensis) female returning to its nest at night. Southern Estonia, May.

Pedro Narra / Green Turtle (Chelonia mydas) returning to sea, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre Sau...

Pedro Narra / Green turtle (Chelonia mydas) returning to see after egg laying, e to open sea after digging nest. Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS End...

Mark Jones / Snares-crested penguin (Eudyptes robustus) group climbing steep route to colony. Snares Island, New Zealand Subantarctic Islands. Endemic. Vulnerable species.

Michael Pitts / Diver Ron Howse ascending the shot line in Lyme Bay, off Portland Bill, Dorset, England, UK, September 2010. Model released.

Enrique Lopez-Tapia,Enrique Lopez-Tapia / Gentoo penguin (Pygoscelis papua) and Antarctic cruise liner 'MV Ushuaia' in Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Markus Varesvuo,Markus Varesvuo / Guillemot (Uria aalge) landing, Vardo, Norway, March.

Laurent Geslin / Hamer man returns from fishing with catfish, Omo valley, Ethiopia, 2006

Andrew Parkinson / Two Kittiwakes (Rissa tridactyla) greeting one another after one returns to the nest site, Farne Islands, UK