Will Burrard-Lucas / Black and white image of African elephant (Loxodonta africana) mud bathing, Tsavo Conservation Area, Kenya. Editorial use only.

Denis-Huot,Denis-Huot / Hippopotamus (Hippopotamus amphibius) males in a muddy pond, aerial view, Rwindi national park, Democratic Republic of Congo. Vulnerable species.

Denis-Huot / African buffalo (Syncerus caffer) male covered with mud after mud bathing, Nakuru National Park, Kenya

Mark Carwardine / Stephen Fry and Mark Carwadine after a mud bath in Borneo, filming for BBC TV series 'Last Chance to See', March 2009

Christophe Courteau / African Buffalo {Sincerus caffer} bull taking a mud bath, Okavango Delta, Botswana.

Tui De Roy / Volcan Alcedo giant tortoises (Chelonoidis nigra vandenburghi) wallowing in rain pools on caldera floor, possibly for thermoregulation or detering parasites, with sulphur fumaroles in background, Alce...

Ben Osborne / African elephant (Loxodonta africana) splashes mud with his foot. Savuti, Northern Botswana. Taken on location for BBC Planet Earth series, 2005

Andy Rouse / African elephant (Loxodonta africana) bull spraying mud at camera, Savute, Botswana (non-ex)

Andy Rouse / African elephant (Loxodonta africana) spraying water from trunk, bathing, Marakele NP, South Africa

Anup Shah / Low angle Warthog {Phacochoerus aethiopicus} about to wallow in mud, Serengeti NP, Tanzania

Tony Heald / African elephant {Loxodonta africana} kicking up white mud (Calcrete and water) Etosha national park, Namibia.

Chris O'Reilly / Red deer stag shaking off mud after wallowing {Cervus elaphus} Scotland, UK