Elephants (Loxodonta africana) at mud wallow, Zimanga private game reserve, South Africa, Africa

Female Sumatran rhino (Borneo rhino) (Dicerorhinus sumatrensis) in wallow, Tabin Reserve, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Female Sumatran rhino (Borneo rhino) (Dicerorhinus sumatrensis) in wallow, Tabin Reserve, Sabah, Borneo, Malaysia, Southeast Asia, Asia

Buffalo shaking itself dry after wallowing in lake at Ranakpur in Pali District of Rajasthan, Western India

Komodo dragon (Varanus komodoensis) waiting for water buffalo, trapped in mud wallow, to die so it can eat it.

Close-up of a common warthog (Phacochoerus africanus) lying on its stomach in the mud at a waterhole next to a butterfly at the Gabus Game Ranch; Otavi, Otjozondjupa, Namibia

Two common warthogs (Phacochoerus africanus) lying in a muddy waterhole on the stony ground on the savanna at the Gabus Game Ranch; Otavi, Otjozondjupa, Namibia

Pod of hippopotamuses (Hippopotamus amphibius) lie in shallow river in Serengeti National Park, Tanzania

Two spotted hyena (Crocuta crocuta) wallow in muddy pool, Serengeti, Tanzania

Two buffalo, Syncerus caffer, wallow and lie in the water, eyes closed, red-billed oxpeckers sit on them, Buphagus erythrorhynchus, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa