Denis-Huot / Male black rhinoceros (Diceros bicornis) silhouetted against clouds, Masai-Mara Game Reserve, Kenya. March.

Wild Wonders of Europe / Bartocha / Piano Perduto, Monti Sibillini National Park, Italy, May, 2009.

Denis-Huot / Cheetah (Acinonyx jubatus) female standing below dark storm clouds, Masai-Mara game reserve, Kenya.

Hougaard Malan / Perito moreno Glacier, Patagonia, Argentina. April 2013. Non-ex.

Ernie Janes / Full moon behind clouds, seen from Norfolk, England, UK, January 2010.

Felicity Lanchester,Felicity Lanchester / Cloud iridescence forming above a cumulonimbus cloud, caused by light refraction through individual water droplets and ice crystals at high altitude, Sierra Leone.

Jack Dykinga / Cheyenne River Sioux Tribal Park with severe storm clouds at sunset amid vast grassland, South Dakota, USA

Juan Carlos Munoz / Northern lights / Aurora borealis, Iceland, Europe, March 2012

Philippe Clement / Cumulus mediocris clouds, Luxembourg

Sven Zacek / Geese on their spring migration above dawn lit clouds. Estonia, Europe, May.

Sven Zacek / Waves washing up a beach on the Baltic coast of Estonia under sunset lit clouds. Europe, August 2011.

Eric Baccega / Melting ice under expansive clouds. Floe Edge, Arctic Bay, Baffin Island, Nunavut, Canada, April 2009.