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

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

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

Baby elephants, Loxodonta africana, playing at wallow in Addo Elephant National Park, Eastern Cape, South Africa

Adult bull Southern elephant seal (Mirounga leonina) hauled out and in a wallow while molting on the beach at Fortuna Bay on South Georgia Island, southern Atlantic Ocean.

Adult bull Southern elephant seal (Mirounga leonina) hauled out and in a wallow while molting on the beach at Fortuna Bay on South Georgia Island, southern Atlantic Ocean.

Adult bull Southern elephant seal (Mirounga leonina) threat posture while hauled out and in a wallow while molting at the abandonded whaling station at Grytviken on the island of South Georgia

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

Adult bull Southern elephant seals (Mirounga leonina) hauled out and in a wallow while molting at the abandonded whaling station at Grytviken on the island of South Georgia, southern Atlantic Ocean.

Adult bull Southern elephant seals (Mirounga leonina) hauled out and yawning in a wallow while molting on the beach at Fortuna Bay on South Georgia Island, southern Atlantic Ocean.

Lion (Panthera leo), black-maned Kalahari male, on road, Kalahari Desert, Kgalagadi Transfrontier Park, South Africa, Africa

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