Daniel Heuclin / Sand Viper (Cerastes vipera) side winding across sand dunes, near Chingueti, Mauritania

Sandra Bartocha / Vehicle tracks through a field of green barley, Jennyhof, Mecklenburg-Vorpommern, Germany, May

Roland Seitre / Hermit / Northern bald ibis (Geroniticus eremita) breeding project of the Jerez de la Frontera Zoo, Cadiz, Spain. Keeper with juvenile birds on open land, keepers wear ibis helmets to limit human impr...

Roland Seitre / Hermit / Northern bald ibis (Geroniticus eremita) breeding project of the Jerez de la Frontera Zoo, Cadiz, Spain. Keeper with two chicks pecking his face, keepers wear ibis helmets to limit human impr...

Lassi Rautiainen / Beginnings of the Northern lights in night sky in winter with conifer trees laden with snow, Kuusamo, northern Finland, February 2009

Eric Dragesco / A large herd of Tien Shan Argali (Ovis ammon karelini) making tracks through snow. Naryn National Park, Kyrgyzstan, Central Asia, November.

John Waters / Hand-reared Whooper Swans (Cygnus cygnus) being trained to fly alongside a car at Weson airfield by Lloyd and Rose Buck for filming purposes. Somerset, UK, January 2011.

Daniel Heuclin / Theropod dinosaur tracks preserved in Lower Jurassic (200 million years old) rock. Near Tuba City, Arizona, USA

Edwin Giesbers / Grey Heron (Ardea cinerea) leaving footprints while walking through snow. The Netherlands, January.

David Noton / The road to Ojo de Perdiz, high on the altiplano, Bolivia, December 2009

Steven Kazlowski / Polar bear (Ursus maritimus) footprints in the snow along a barrier island during autumn freeze up, Bernard Spit, 1002 area of the Arctic National Wildlife Refuge, Alaska. October 2009

Nick Upton / 2020VISION / Common / Eurasian cranes (Grus grus) small flock of juveniles taking flight over the frozen, snow covered pastureland on a foggy winter morning. These Cranes were released by the Great Crane Project...