Wild Wonders of Europe / Shpilenok / Saiga antelope (Saiga tatarica) herd at salt lick, Cherniye Zemli (Black Earth) Nature Reserve, Kalmykia, Russia, May 2009

Jim Brandenburg / Moose (Alces alces andersoni) female looking in car window during winter, the animals lick salt off of cars, Minnesota

Pete Oxford / Green winged macaws perched by salt lick. Madre De Dios River, Peru, Amazon, South America

David Pattyn / Alpine Ibex (Capra ibex) males licking salt at the edge of a road, Valsavarenche, Gran Paradiso national park, Aosta Valley, Italy, May

David Pattyn / Alpine Ibex (Capra ibex) males licking salt at the edge of a road, Valsavarenche, Gran Paradiso national park, Aosta Valley, Italy, May

Lucas Bustamante / Scarlet macaws (Ara macao) on salt lick, Tambopata, Madre de Dios, Peru.

Lucas Bustamante / Two Dusky-headed parakeets (Aratinga weddellii) at a clay lick, Yasuni National Park, Orellana, Ecuador.

Kim Taylor / Holly blue butterfly (Celastrina argiolus) male at 'salt lick' on peat. Surrey, England, UK, July.

Ann & Steve Toon / Sable (Hippotragus niger) licking salt, Chobe National Park, Botswana, June

Bernard Castelein / Ring-tailed lemur (Lemur catta) mother carrying baby, at mineral lick, Anjaha Community Conservation Site, near Ambalavao, Madagascar.

Kim Taylor / Wood white butterflies (Leptidea sinapis) at 'salt lick' beside a woodland stream, Bulgaria, July.

Kim Taylor / Wood white butterflies (Leptidea sinapis) at 'salt lick' beside a woodland stream, Bulgaria, July.