Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Delicate Arch and the La Sal Mountains, Arches National Park, Utah

Jeff Foott / Winding road and sandstone formations, La Sal Mountains, Arches National Park, Utah

Jeff Foott / Sandstone rock formations, La Sal Mountains, Arches National Park, Utah

Yashpal Rathore / Asiatic elephant (Elephas maximus), herd passing through Sal tree forest. Jim Corbett National Park, India.

Andy Rouse / Common wallaroo (Macropus robustus) hopping in late sunlight, Sal Salis, Ningaloo Reef, Cape Range National Park, Western Australia

Andy Rouse / Common wallaroo (Macropus robustus) in late sunlight, Sal Salis, Ningaloo Reef, Cape Range National Park, Western Australia

Pete Oxford / Salt mounds and evaporation ponds (sea salt production plant started in the 1600's and worked by african slaves) Cargill Solar Salt Works, Pekelmeer lagoon, Bonaire, Netherlands Antilles, Caribbean

Loic Poidevin / Stone and wooden hut in Amhed ila village at sunrise on Karoum salt lake, Danakil depression, north Ethiopia, February 2009

Jack Dykinga / Valle de la Luna, The Codillera de Sal, formed by layer upon layer of salt, sand and clay, creating strata that buckled with earth's crust and lined with sand dunes. Atacama Desert, Chile. April 2009

Wild Wonders of Europe / Elander / Bearded vulture (Gypaetus barbatos) adult and juvenile, Serra de Beumort, Gerri de la Sal, Catalonia, Spain, November 2008

Wild Wonders of Europe / Elander / Bearded vulture (Gypaetus barbatus) flying over Griffon vultures (Gyps fulvus) on the ground, Serra de Beumort, Gerri de la Sal, Catalonia, Spain, November 2008