Anup Shah / African elephants (Loxodonta africana) rear view, drinking at a water hole, Masai Mara National Reserve, Kenya. March

Suzi Eszterhas / Banded mongoose (Mungos mungo) sitting on hind legs alert, rear view, Masai Mara Reserve, Kenya

Anup Shah / Southern / Maasai giraffe (Giraffa camelopardalis tippelskirchi) male spreading legs to drink, rear view, Masai Mara National Reserve, Kenya. February.

Anup Shah / Olive baboon (Papio cynocephalus anubis) male standing on his hind legs watching a female presenting her rear, Masai Mara National Reserve, Kenya. February.

Charlie Summers / Two Wild Mustang (Equus caballus) stallions rear on hind legs, fighting for dominance in a mountain meadow. Montana, USA

Charlie Summers / Two Wild Mustang (Equus caballus) stallions rear on hind legs, fighting for dominance in a mountain meadow. Montana, USA

Stephen Dalton / European edible frog {Rana esculenta} mature tadpole with rear and front legs developed, underwater, controlled conditions

Stephen Dalton / European edible frog {Rana esculenta} tadpole with rear legs developed, controlled conditions

Stephen Dalton / European edible frog {Rana esculenta} mature tadpole with fully developed rear legs, controlled conditions

Wild Wonders of Europe / Wothe / Rear view of Common hamster (Cricetus cricetus) standing on hind legs feeding, Slovakia, Europe, June 2009

Carol Walker / Rear view of Polar bear {Ursus maritimus} climbing over snowbank, Spitsbergen

Wild Wonders of Europe / Radisics / Hermann's tortoise (Testudo hermanni) going into undergrowth, near Meteora, Greece, October 2008

Juan Carlos Munoz / Close up of tail and rear legs of Siberian tiger {Panthera tigris altaica} captive, China

Juan Carlos Munoz / European lynx (Lynx lynx) close up of rear legs and short tail, Laponia / Lappland , Finland Captive

Jane Burton / Rear view of Agouti dwarf female rabbit sitting up on her hind legs to look around

Jane Burton / Toggenburg x Pygmy goat kid {Capra hircus} standing up on rear legs, UK

Heidi & Hans-Juergen Koch / Honey Bee (Apis mellifera) with pollen baskets on hind legs, Bee Station at the Bavarian Julius-Maximilians-University of Wurzburg, Germany

Carol Walker / Mustang (Equus caballus) mare rear view in winter, grulla color with primitive stripes on legs and back. Pryor Mountains, Montana.

Shattil & Rozinski / Ocicat kitten {Felis catus} standing on rear legs

Anup Shah / Banded mongoose {Mungos mungo} foraging for parasites on skin between back legs of Warthog {Phacochoerus aethiopicus}, Queen Elizabeth NP, Uganda

Piotr Naskrecki / Daddy-Long-Legs Spider (Pholcus phalangioides) the body resembles a gondola suspended on long flexible stilts, Guinea, West Africa

Richard Du Toit / Striped Ground Squirrel {Xerus erythropus} standing on rear legs, Gemsbok NP, Kalahari, South Africa.

Jane Burton / Domestic Cat {Felis catus} Brown spotted tabby 'Lowlander' standing on rear legs.

Jane Burton / Domestic Cat {Felis catus} lilac-and-white Burmese-cross kitten standing on rear legs among Pink chrysanthemums and Heather

Jane Burton / Domestic Cat {Felis catus} kitten standing on rear legs.

Jane Burton / Domestic Cat {Felis catus} Brown spotted tabby 'Lowlander' standing on rear legs.

Steven Kazlowski / Rear-view of Grizzly bear {Ursus arctos horribilis} standing on hind legs, Denali National Park, Alaska, USA.

Jane Burton / Mudskipper display (Periophthalmus barbarus) raised dorsal fin. Captive.

Carol Walker / Handler training Grey Andalusian stallion to rear on back legs (levade) USA. Model released.

Norbert Wu / Millipede (Tylobolus deses) has 300 legs, California

Norbert Wu / Millipede (Tylobolus deses) coiled into a protective ball, has 300 legs, California

Marguerite Smits Van Oyen / Meerkat standing on hind legs {Suricata suricatta} Tswalu Kalahari Reserve South Africa

Sean Crane / Black-handed Spider Monkey (Ateles geoffroyi) walking on legs, Punta Laguna Nature Preserve, Yucatan Peninsula, Mexico

Premaphotos / Large fruit fly (Xyphosia miliaria) male stroking a female's rear end with his legs to induce her to mate with him, UK

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female standing on hind legs in shallows looking for Salmon, Katmai National Park, Alaska

Pete Oxford / Patas monkey (Erythrocebus patas) standing alert on top of termite mound, Murchison Falls National Park, Uganda.

Suzi Eszterhas / Meerkat (Suricata suricatta) standing on termite mound, Makgadikgadi Pans, Botswana.

George Sanker / Black bear (Ursus americanus) foraging for Rose hips (Rosa sp.) on cliff side, Yellowstone National Park, Wyoming, USA. September.

Christophe Courteau / Yellow mongoose (Cynictis penicillata) standing on hind legs, Savuti Game Reserve, Chobe National Park, Botswana.

Jiri Lochman / Common rock rat (Zyzomys argurus) portrait, Mitchell Plateau, The Kimberley, Western Australia.

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck urinating on legs to scent-mark in autumn, North America

Yves Lanceau / Dog, Jack Russell Terrier, three puppies with pumpkin

Bert Willaert / Close-up of the large spine on the femur of the rear legs of a male thorny devil stick insect (Eurycantha calcarata), Willaumez Peninsula, New Britain, Papua New Guinea, December

Alex Hyde / Thick-legged Flower Beetles (Oedemera nobilis). Two males showing variation in colour. Males have much thicker rear legs compared to females. Phototgraphed on a white background in mobile field studio...

Etienne Littlefair / Rear view of a Northern long-neck turtle (Chelodina rugosa) swimming away in a small Adelaide River tributary at night, Northern Territory, Australia. May. Cropped image.

Pal Hermansen / Roe deer (Capreolus capreolus) two walking, head and rear end view only, Akershus, Viken, Norway.

Pal Hermansen / Hedgehog (Erinaceus europaeus) aged two weeks in rehabilitation centre, rear view. Norway. July. Captive. Controlled conditions.

Karine Aigner / Rear half of wild male Bobcat (Lynx rufus) showing its short tail, Texas, USA.