Paul Souders/ Worldfoto / Red algae and salt formations, Lake Natron, Ol Doinyo Lengai, Tanzania

Vincent Grafhorst / Salt flat, Lake Asale, Danakil Depression, Ethiopia

Vincent Grafhorst / Dromedary (Camelus dromedarius) caravan transporting salt across salt flat, Lake Asale, Danakil Depression, Ethiopia

Thomas Marent / Citrus Butterfly (Papilio demodocus) drinking minerals and salts from soil, Jozani National Park, Zanzibar, Tanzania

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) in flight, taking a flying high speed 'belly-dip' into the Yarra river at the end of a very hot day. They do this to wet their fur which both...

Doug Gimesy / Grey-headed Flying-fox (Pteropus poliocephalus) in flight just after a belly-dip into the Yarra river at the end of a very hot day. They do this to wet their fur which both acts as a form of evaporati...

Doug Gimesy / A Grey-headed Flying-fox (Pteropus poliocephalus) in flight just after having taken a flying high speed belly-dip into the Yarra river at the end of a very hot day. They do this to wet their fur which...

Paul Souders/ Worldfoto / Red algae and salt formations, Lake Natron, Tanzania

Paul Souders/ Worldfoto / Red algae and salt formations on alkaline Lake Natron, Tanzania

Shane P. White / Salt flat, Salar de Uyuni, Bolivia