Paul D Stewart / Lithograph with contemporary colouring, continental version of the last wallchart produced by Benjamin Waterhouse Hawkins for the Department of Science and Art 1862. It is entitled 'Pachydermata and C...

Niall Benvie / Boy and girl dragging a Christmas tree home from the forest, Angus, Scotland, UK, January 2010, model released

Loic Poidevin / Man working in salt extraction from Karoum salt lake, Danakil depression, northern Ethiopia, February 2009

Jane Burton / Sable Border Collie puppy, 9 weeks, looking over his shoulder.

Juergen Freund / Dock worker carrying Yellowfin tuna ashore for weighing, Jacana tuna fish landing, Puerto Princesa, Palawan, Philippines, April 2009

Ernie Janes / Domestic ferret (Mustela putorius furo) being taken out for a walk in winter, Southrepps, Norfolk, UK, November 2008

Christophe Courteau / Wild Chimpanzee (Pan troglodytes schweinfurthii) holding branch and looking over shoulder. Kibale National Park, Uganda

Andy Trowbridge / New Zealand Falcon (Falco novaeseelandiae) , female, close up portrait of head and shoulder, Oreti River, Mossburn, Southland, South Island, New Zealand. December.

Eric Medard / Little owl (Athene noctua) sitting on young boy's shoulder, rescued animal, France. Model released

Roger Powell / Razorbill (Alca torda) portrait of bird looking over its shoulder, Great Saltee Island, Wexford, Republic of Ireland June

Andy Rouse / Cheetah (Acinonyx jubatus) looking over shoulder, Masai Mara National Reserve, Kenya

Petra Wegner / British Shorthair Cat, kitten sitting looking back over shoulder, black-golden-classic, 10 weeks

Petra Wegner / Neva masquarade / Siberian forest cat kitten looking over shoulder, 3 months

Brent Stephenson / New Zealand Fur Seal (Arctocephalus forsteri) pup on rocks, looking back over its shoulder at the camera. Near Kaikoura, Canterbury, New Zealand, October.

Sven Zacek / Moose (Alces alces) looking back over its shoulder in forest. Estonia, Europe, April.

Ole Jorgen Liodden / Oryx (Oryx gazella) looking back over its shoulder. Kalahari, Botswana, November.

Fabrice Cahez / Wild cat (Felis silvestris) looking over its shoulder, Vosges, France, May

Robert Thompson / Grey shoulder knot moth (Lithophane ornitopus) camouflaged on rock, Argory Moss, Derrycaw, County Armagh, Northern Ireland, UK, April

Robert Thompson / Grey shoulder knot moth (Lithophane ornitopus) camouflaged on rock, Argory Moss, Derrycaw, County Armagh, Northern Ireland, UK, April

Philippe Clement / Western Green Lizard (Lacerta bilineata) carrying ticks (visible around its shoulder). La Brenne, France, April.

Pete Oxford / Portrait of a Huaorani man with blowgun over his shoulder. Bameno Community, Yasuni National Park, Ecuador, May 2007. Model release B#1.

Axel Gomille / Sloth Bear (Melursus ursinus) cub looking over his shoulder at the photographer. Karnataka, India, April.

Jane Burton / Yellow Labrador retriever bitch, 1 year, sitting rear view, looking back over shoulder.

Inaki Relanzon / Chamois (Rupicapra rupicapra) looking over its shoulder. Cad' Pedraforca Nature Reserve, Barcelona province, Catalonia, Spain, July.

Troels Jacobsen/Arcticphoto / Young Antarctic Fur Seal (Arctocephalus tropicalis) looking over its shoulder. Quest Bay, Gough Island, South Atlantic Islands, March.

Mark Taylor / Ginger kitten, looking over his shoulder.

Mark Taylor / Ginger kitten, looking over his shoulder.

Mark Taylor / Ginger kitten, rear view looking over his shoulder.

Mark Taylor / Ginger-and-white kitten looking over its shoulder.

Brent Stephenson / Bristle-thighed Curlew (Numenius tahitiensis) looking back over its shoulder. Diagnostic bristles are visible. Takutea, Cook Islands, November.

Staffan Widstrand / Galapagos Land Iguana (Conolophus subcristatus) head and shoulder in profile showing horny crest. Baltra, Galapagos, Ecuador, April.

Edwin Giesbers / Close-up of Eurasian Jay (Garrulus glandarius) showing shoulder and primary flight feather colours. The Netherlands, June.

Fergus Gill / Mountain hare (Lepus timidus) peering over its shoulder. Cairngorms National Park, Scotland, July

Hanne & Jens Eriksen / Lesser black backed gull {Larus fuscus graellsii} looking over shoulder, Iceland, June

Aflo / Domestic cat being carried on woman's shoulder

Aflo / Domestic cat, kitten sitting on woman's shoulder

Stephen Dalton / Flame shoulder moth (Ochropleura plecta) on fallen leaf, UK

Stephen Dalton / Flame shoulder moth (Ochropleura plecta) resting on dead leaves, UK

Stephen Dalton / Shoulder striped wainscot moth (Mythimna comma) sequence of three multiflash images of take-off and flight

Stephen Dalton / Shoulder striped wainscot moth (Mythimna comma) sequence of three multiflash images of take-off and flight

Patricio Robles Gil / Matador challenging bull with red cloak, about to pierce bull between the shoulder blades, Plaza de Toros, Mexico City, Mexico

Patricio Robles Gil / Matador challenging bull with red cloak, and piercing bull between the shoulder blades, Plaza de Toros, Mexico City, Mexico

Gerrit Vyn / Adult male American Bittern (Botaurus lentiginosus) vocalising and displaying its large white shoulder plumes during courtship period. This bird is in the process of inflating its esophagus during voc...

Gerrit Vyn / Adult male American Bittern (Botaurus lentiginosus) displaying white shoulder plumes during courtship in a marsh. Montezuma NWR, New York, USA

Robert Thompson / Blair's shoulder-knot moth {Lithophane leautieri hesperica} camouflaged on lichen, County Down, Northern Ireland, UK, November

Robert Thompson / Shoulder stripe moth {Anticlea badiata} camouflaged on tree, Benone Magilligan, Co. Londonderry, Northern Ireland, UK, March

Mark Taylor / Bengal x Birman cat, Spice, sitting looking over its shoulder

Mark Taylor / Young Burmese cat, sitting, looking over shoulder

Mark Taylor / Girl with ginger kitten, 7 weeks, on her shoulder, model released

Mark Taylor / Brown Roan Italian Spinone puppy, Riley, 13 weeks, lying looking over his shoulder

Mark Taylor / Brown Roan Italian Spinone puppy, Riley, 13 weeks, sitting looking over his shoulder

Mark Taylor / Belgian Shepherd Dog puppy, Antar, 10 weeks, looking backwards over shoulder

Mark Taylor / Beagle puppy, Florrie, 4 months, sitting, looking over her shoulder.

Mark Taylor / Ragdoll kitten with deep blue eyes, 12 weeks, looking back over shoulder

Mark Taylor / Bearded Collie bitch, Ellie, rear view sitting looking over her shoulder

David Kjaer / Tawny Owl (Strix aluco) captive, perched on gate, looking backwards over shoulder, UK

David Kjaer / Tawny Owl (Strix aluco) captive, perched on gate, looking backwards over shoulder, UK

Kerstin Hinze / Grey Seal (Halichoerus grypus) looking backwards over its shoulder on the beach, Helgoland, North Sea, Germany

Suzi Eszterhas / Close up of fur markings on shoulder of Black-backed Jackal {Canis mesomelas} Masai Mara Triangle, Kenya

Inaki Relanzon / Indri (Indri indri) looking back over its shoulder, Mantadia-Andasibe National Park, Madagascar

Carol Walker / Paint horse looking over his shoulder, Flitner Ranch, Shell, Wyoming, USA

Pete Oxford / White-fronted Capuchin (Cebus albifrons) on boy's shoulder, Puerto Misahualli, Amazon Rainforest, Ecuador

Roger Powell / Rear view of Rainbow Lorikeet {Trichoglossus haematopus} on park fence looking over shoulder, Victoria, Australia

Roger Powell / Noisy Miner {Manorina melanocephala} looking back over shoulder, Victoria, Australia

Roger Powell / Corn bunting {Emberiza calandra} in grass looking over shoulder, Evora, Portugal

Bruno D'Amicis / Moose (Alces alces) young male looking over his shoulder. Biebrza marshes, Poland

Gary K. Smith / Grey Shoulder Knot moth {Lithophane ornitopus lactipennis} at rest on garden fence, December, UK

Pete Oxford / Hani woman carrying a domestic duck on her shoulder. Hani Ethnic minority people. Yuanyang, Honghe Prefecture, Yunnan Province, China 2006

Jane Burton / Physiotherapist using H-Wave machine on injured shoulder of elderly sable Border Collie bitch

Jane Burton / Back view of Sable Border Collie pup, sitting and looking over his shoulder

Jane Burton / Back view of Cairn Terrier pup, 5 months old, looking over her shoulder.

Elio Della Ferrera / Portrait of male Hamadryas Baboon (Papio hamadryas) looking over shoulder, Ethiopia 1992

Michael Hutchinson / Ruppell's Griffon Vulture (Gyps rueppellii), Lewa Downs clearly showing naked shoulder patches, Kenya

Michael Hutchinson / Ruppell's Griffon Vulture (Gyps rueppellii) clearly showing naked shoulder patches, Lewa Downs, Kenya

Dave Bevan / Wart Biter (Decticus verrucivorus) on shoulder of man, Hungry

Pete Oxford / Verreaux's Sifaka (Propithecus verreauxi) mother with baby peeking over her shoulder, vulnerable, Berenty Reserve, southern Madagascar

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) big buck in velvet looking back over his shoulder

Hanne & Jens Eriksen / Osprey {Pandion haliaetus} perched on a twig looking over its shoulder, Khawr Taqah, Oman

Flip de Nooyer / Western Roe Deer (Capreolus capreolus) adult looking back over its shoulder, Europe

Jim Brandenburg / Timber Wolf (Canis lupus) pup looking back over its shoulder, North America

Mark Raycroft / White-tailed Deer (Odocoileus virginianus) buck entering cedar forest, looking back over his shoulder

Carol Walker / Mustang / Wild horse - Old Stallion looking over his shoulder, Wyoming, USA. Adobe

Xi Zhinong / Timber Wolf (Canis lupus) adult standing on bare ground, looking back over its shoulder, Kekexili, Qinghai Province, China

Pete Oxford / Scarlet Macaw (Ara macao) on shoulder of Machiguenga Indian, Lower Urubamba River, Amazon, Peru

Jim Brandenburg / Timber Wolf (Canis lupus) looking back over its shoulder through trees, Minnesota

Mitsuaki Iwago / Sambar (Cervus unicolor) drinking while a heron perches on its shoulder, India

Martin Dohrn / Arara Indian child with capuchin monkey perched on his shoulder. Amazon Basin. Brazil

Sumio Harada / Coyote (Canis latrans) pup looking back over its shoulder, Glacier National Park, Montana

Piotr Naskrecki / Manaus Slender-legged Treefrog (Osteocephalus taurinus) in rainforest looking over its shoulder, Suriname

David Pike / Boxer looking back over shoulder, portrait

Florian Möllers / Golden Snub-nosed Monkey (Rhinopithecus roxellana qinlingensis) male looking back over its shoulder. Zhouzhi Nature Reserve, Shaanxi, China, October.

Mark Taylor / Merle Border Collie puppy, 6 weeks, looking over his shoulder.

Mark Taylor / Border Collie looking over its shoulder.

Robert Thompson / Shoulder stripe moth (Anticlea badiata) Lackan Bog, County Down, Northern Ireland, UK, April

Robert Thompson / Grey shoulder-knot moth (Lithophane ornitopus) Rehaghy Mountain, County Tyrone, Northern Ireland, April

Petra Wegner / Dalmatian, sitting, looking back over shoulder