Erlend Haarberg / Marble formations in alpine landscape. Lahko National Park, Fjell, Norway, July.

Pete Oxford / Tiger tree frog (Hyloscirtus tigrinus) captive, endemic to Ecuador.

Scott Leslie / Osprey (Pandion haliaetus) carrying Marble Cichlid (Astronotus ocellatus) prey, Viera Wetlands, Florida

Gavin Hellier / Women in colourful Saris, beside the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, 2011. Model released.

Ross Hoddinott / Marbled White butterfly (Melanargia galathea) resting on grass, Dunsdon Nature Reserve, Devon, UK. July

Philippe Clement / Water in the abandoned red marble quarry of Carriere de Beauchateau in the Belgian Ardennes, Belgium, August 2012

Mark Taylor / 'The Marble Cathedrals' - marble rocks dissolved and sculpted by water. Rio Tranquilo, Chile, March 2010.

Michel Roggo / Marble trout (Salmo trutta marmorata) morph of the Brown Trout, at spawning ground, Tolminka river, Slovenia, 2005

Michel Roggo / Marble trout (Salmo trutta marmorata) morph of the Brown Trout, female at spawning ground, Tolminka river, Slovenia, 2005

Michel Roggo / Marble trout (Salmo trutta marmorata) morph of the Brown Trout, male and female at spawning ground, Tolminka river, Slovenia, 2005

Robert Thompson / Long John Silver stalactite in the Marble Arch Caves, Enniskillen, County Fermanagh, Northern Ireland, UK, January 1995

Jack Dykinga / Lichen covered rocks at Marble Viewpoint, Kaibab National Forest, Grand Canyon National Park, Arizona, USA