Kirkendall-Spring / Snowboarder descending Table Mountain in the Heather Meadows Recreation Area, Washington, USA. March 2013.

Alex Mustard / Diver explores the cathedral at Silfra Canyon, deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates, at Thingvellir National Park, Iceland. May 2011....

Alex Mustard / A diver explores Nikulasargj Canyona deep fault filled with fresh water in the rift valley between the Eurasian and American tectonic plates at Thingvellir National Park, Iceland. May 2011. In this ph...

Markus Varesvuo,Markus Varesvuo / Pair of Common ravens (Corvus corax) displaying, Vardo, Norway, March.

Orsolya Haarberg,Orsolya Haarberg / Muskox (Ovibus moschatus) herd, in the Dovrefjell-Sunndalsfjella National Park, Norway. February

Juan Carlos Munoz / People descending into the Thrihnukagigur volcano a dormant volcano, now used for tours, Iceland, Europe, June 2012

Andrew Parkinson / Nuthatch (Sitta europaea) decending the trunk of Silver Birch (Betula verrucsa) tree, Derbyshire, UK. December (non-ex)

Jack Dykinga / Roots of Fig trees (Ficus sp) growing in the collapsed Cenote Oxpeejool (sink hole), near Tekax, Yucatan, Mexico. Afternoon light illuminates the elongated cavern on the right. October 2009

Jack Dykinga / Cenote Samula (sink hole) with elongated roots of a Fig tree (Ficus sp) from ground level descending to the subterranian tourquoise coloured water below. Rays of sulight pass through the hole to illum...

Mitsuaki Iwago / Blue Wildebeest (Connochaetes taurinus) herd descending cliff during migration, Serengeti

Tui De Roy / Glacial tongue of Dugdale and Murray Glaciers descending the Admiralty Mountains into Robertson Bay, Victoria Land, Antarctica

Mark Moffett / Cristian Samper examines the initial descending root of a Clusia hemiepiphyte in rainforest canopy, La Planada, Colombia