Piotr Naskrecki / Mexican Red Rump Tarantula (Brachypelma vagans), Belize

Espen Bergersen / Adult male King eider (Somateria spectabilis) portrait from behind also showing triangular black sails on the back and white sides of rump. Batsfjord, Norway, March.

Lisa Hoffner / A baby orphan Elephant (Loxodonta africana) leaning against the rump of its friend. David Sheldrick Wildlife Trust Nairobi Elephant Nursery, Kenya, August 2010.

Thomas Marent / Drill (Mandrillus leucophaeus) female with swollen rump, Afi Mountain Wildlife Sanctuary, Nigeria

Nick Upton / Veterinarian Dewi Jones injecting antibiotics into the rump of a sick Holstein Friesian cow (Bos taurus) held in a crush, Gloucestershire, UK, September 2014. Model released.

Jabruson / Okapi (Okapia johnstoni) rump pattern with stripes, Ituri Rainforest, Okapi Faunal Reserve, Democratic Republic of Congo.

Brent Stephenson / Wilson's storm petrel (Oceanites oceanicus) bouncing off the water whilst feeding, showing rump and upperwing from behind. Cuverville Island, Antarctic Peninsula, Antarctica. December.

Fiona Rogers / Western chimpazee (Pan troglodytes verus) female 'Velu' aged 51 years greeting juvenile female 'Joya' aged 6 years by inspecting her genitals and rump. Bossou Forest, Mont Nimba, Guinea. January 2011.

Roland Seitre / New River Rust Rump Tarantula (Aphonopelma sp.). Captive. Tenerife, Canary Islands. Endemic to North American hot deserts.

Stephen Dalton / Red rump tarantula spider (Brachypelma vagans) from South America

Fiona Rogers / Rear view of mature wild male Mandrill (Mandrillus sphinx) walking through gallery forest during dry season. Showing sexual colouration of rump. Lope National Park, Gabon. July 2008.

Michael D. Kern / Costa Rican Tiger Rump tarantula {Cyclosternum fasciata} captive, from Costa Rica