860-291910 - Green turtle (Chelonia mydas) swimming back to the surface to breathe after feeding on seagrass. Abu Dabbab Bay, Marsa Alam, Egypt, Red Sea

860-291906 - Dugong (Dugong dugon) swimming back to the surface to breathe after feeding on seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Alam, Egypt. Red Sea

860-291905 - Dugong (Dugong dugon) swimming back to the surface to breathe after feeding on seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Alam, Egypt. Red Sea

1116-52875 - View taken from behind of two women sitting on a mountain top with their dog enjoying the view, while exploring and photographing the amazing scenery of the Yukon along the Sam McGee Trail near Carcross, Yukon, Carcross, Yukon Territory, Canada

1116-52869 - Portrait of a Cape Buffalo (Syncerus caffer) drinking from river carrying two cattle egrets (Bubulcus ibis) on its back in Chobe National Park, Chobe, Botswana

1116-52868 - Portrait of a Cape Buffalo (Syncerus caffer) drinking from river carrying two cattle egrets (Bubulcus ibis) on its back in Chobe National Park, Chobe, Botswana

1116-52836 - African bush elephant (Loxodonta africana) standing on the savannah throwing dust over itself at Segera, Segera, Laikipia, Kenya

832-401279 - Back view of Hawksbill Sea Turtle (Eretmochelys imbricata) or Bissa swims up in the blue Ocean, Red sea, Egypt, Africa

759-10640 - Rear View of White Rhinoceros, Cerathotherium simum, Namibia

832-400134 - Nile crocodile (Crocodylus niloticus) closeup of the reptile's back and tail. Yellow eye. Chobe National Park, Botswana, Africa

832-399690 - Turn back time - concept of turning clock backwards

1174-11401 - Yellow Billed Oxpeckers, Buphagus africanus, on the back of a buffalo, Londolozi Wildlife Reserve, Sabi Sands, South Africa

809-8645 - Quan Am Bo Tat temple, Buddhist ceremony of releasing birds back into the wild to help an individual accrue merit, Vung Tau, Vietnam, Indochina, Southeast Asia, Asia

83-13366 - Horse for hire on the popular sandy beach at this laid-back village andresort, Samara, Nicoya Peninsula, Guanacaste, Costa Rica, Central America

832-397964 - Overhead composition with raw beef ossobuco on butcher cleaver over back background

860-291090 - Zebra (Equus quagga). Back view. Kenya. Tanzania. National Park. Serengeti. Maasai Mara.

860-291205 - Portrait of a buffalo (Syncerus caffer) with birds on his back in the savannah. Close-up. Africa. Uganda.

805-1467 - Goats being herded back home at dusk along main road and heavy traffic into Bhuj city, Gujarat, India, Asia

832-397134 - Panorama with lake and mountains and cows, Pilatus in the back, Weggis, Lake Lucerne, Canton Lucerne, Switzerland, Europe

1112-6713 - Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

1112-6714 - Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

1112-6712 - Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

860-290817 - Serval (Leptailurus serval) in the savannah, cub (2 months old) jumped on the mother's back, Masai Mara National Reserve, National Park, Kenya, East Africa

746-91687 - Heck Cattle (Bos primigenius taurus), an attempt to breed back the extinct Aurochs from domestic cattle. Winter in the National Park Bavarian forest (Bayerischer Wald)(enclosure). Europe, Central Europe, Germany, Bavaria, February

746-91686 - Heck Cattle (Bos primigenius taurus), an attempt to breed back the extinct Aurochs from domestic cattle. Winter in the National Park Bavarian forest (Bayerischer Wald)(enclosure). Europe, Central Europe, Germany, Bavaria, February

1350-5513 - western diamondback rattlesnake or Texas diamond-back (Crotalus atrox). Park of the Nature of Cabarceno. Cabarceno, Cantabria, Spain.

1336-390 - Back view of two young people and their beloved wolf dog sitting and hugging in an old town street staring at the sun, Piemonte, Italy, Europe

1174-11105 - A lion, Panthera leo, attacks a buffalo, Syncerus caffer, leaping on its back, Londolozi, Sabi Sands, South Africa

1178-41096 - Caucasian woman and dog doing yoga stretching backs

1178-41097 - Caucasian woman and dog doing yoga stretching backs

1174-10751 - A wild dog, Lycaon pictus, stands in fallen leaves, direct gaze, back lit, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

1174-10736 - A male leopard, Panthera pardus, lies on a termite mound at sunset, back lit, looking out of frame, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

1174-10745 - A female leopard, Panthera pardus, lies on a boulder in sunlight, ears back, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

1174-10733 - A male leopard, Panthera pardus, walks on a dirt track, ears back, Londolozi Wildlife Reserve, Sabi Sands, South Africa

1174-10793 - A leopard, Panthera pardus, walks along a dirt track, ears back, dry brown grass background, Londolozi Wildlife Reserve, Sabi Sands, Greater Kruger National Park, South Africa

1116-52169 - Men hunting from the Blue Duck Lodge, a working cattle farm with a focus on conservation, located in the Whanganui National Park. One man carrying goat kill on his back, (goats are a danger to the native wildlife and hunting is encouraged and educated here); Retaruke, Manawatu-Wanganui, New Zealand

1116-51926 - View taken from behind of two women riding horses (Equus ferus caballus) traveling past acacia tree through the bush towards the hills at the Gabus Game Ranch at sunset; Otavi, Otjozondjupa, Namibia

1116-51963 - View taken from behind of two women riding horses following a Southern giraffe (Giraffa camelopardalis angolensis) through the bush at the Gabus Game Ranch; Otavi, Otjozondjupa, Namibia

1116-52047 - Common loon (Gavia immer), an adult loon carries two babies on his back, La Mauricie National Park; Quebec, Canada

1116-52230 - Three young adults sit in the back of a dune buggy with dogs after a muddy tour; Retaruke, Manawatu-Wanganui, New Zealand

1116-51516 - African Elephant family (Loxodonta), Etosha National Park; Namibia

1116-51962 - Two women riding horses (Equus ferus caballus) on a dirt road traveling through the bush at the Gabus Game Ranch with a southern giraffe (Giraffa camelopardalis angolensis) in the background; Otavi, Otjozondjupa, Namibia

1116-51965 - Black wildebeest (Connochaetes gnou) standing in the golden long grass of the savanna looking back over shoulder at the camera at the Gabus Game Ranch; Otavi, Otjozondjupa, Namibia

1116-51279 - Three Adelie penguins (Pygoscelis adeliae) watch another jumping between two ice floes. They have black heads and backs with white bellies. Shot with a Nikon D810 on Brown Bluff; Antarctica

1116-51948 - Extreme close-up of the striped fur and mane of a plains zebra (Equus quagga - formerly Equus burchellii) in the Etosha National Park; Otavi, Oshikoto, Namibia

1116-52048 - Common loon (Gavia immer), an adult loon carries two babies on his back when the other adult feeds on of them with a damselfly larva, La Mauricie National Park; Quebec, Canada

1113-106684 - Detail view from the back of a crocodile, Cooinda, Kakadu National Park, Northern Territory, Australia

832-393722 - Spotted reef in the middle of seagrass meadow, Favia stone coral (Platygyra lamellina) in front, Red Sea fire coral (Millepora dichotomata) in the back, Red Sea, Aqaba, Kingdom of Jordan

1350-2898 - A line of camels (Camelus) carrying bags of hay on their back travel down road, in Danakil Depression, Ethiopia

1350-2897 - A man leads a line of camels (Camelus) carrying bags of hay on their back travel down road, in Danakil Depression, Ethiopia

1174-10533 - A leopard, Panthera pardus, rolls onto its back and bites a stick, direct gaze, Londolozi Game Reserve, South Africa

832-391523 - Hikers at Upper Two Medicine Lake, mountain peak Lone Walker Mountain in the back, dramatic clouds, Glacier National Park, Montana, USA, North America

1350-221 - Adult bull American Bison buffalo ( Bos bison ) with Brown-headed Cowbird ( Molothrus ater ) on back in prairie landscape at Riding Mountain National Park Manitoba Canada

1116-49673 - Research divers from the MOC Marine Institute glue broken coral heads back together and map out coral damage at Molokini Marine Preserve off the island of Maui, Hawaii. In the future, data from here will help to determine the health of Hawaii's reefs, Maui, Hawaii, United States of America

1116-49661 - A Green sea turtle (Chelonia mydas), an endangered species, makes it’s way from the beach back into the Pacific Ocean, Maui, Hawaii, United States of America

1116-49172 - Female Chimpanzee (Pan troglodytes) lying on its back with baby in arms is groomed by another female in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-49173 - Female Chimpanzee (Pan troglodytes) lying on her back cradles her baby while another female Chimpanzee looks on in Mahale Mountains National Park on the shores of Lake Tanganyika, Tanzania

1116-50377 - Lion cub (Panthera leo) looks back climbing tree trunk, Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

1116-50379 - A backlit male hippopotamus (Hippopotamus amphibius) stands half-submerged in water, staring menacingly towards the camera. His skin is pink and grey, and one ear is folded back. Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

1116-50258 - Wood bison bull (Bison bison athabascae) portrait, Alaska Wildlife Conservation Center in South-central Alaska. The Alaska Wildlife Conservation Center played a big part in helping reintroduce these animals back into the Alaska wilds; Portage, Alaska, United States of America

1116-50328 - Puma sitting and looking back at the camera, Southern Chile; Chile

1116-50264 - Cow moose (Alces alces) with rare triplet calves try to cross the Park Road in a rainstorm, however, turned back and went into the woods possibly because of the traffic, Denali National Park and Preserve; Alaska, United States of America

1116-50411 - Black-shouldered kite (Elanus caeruleus) perches on thornbush looking back, Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

1113-104579 - Camels in the back light of the morning sun, Gobi desert, Mongolia

832-390014 - Koalas (Phascolarctos cinereus), mother with young on her back running on branch, social behaviour, Parndana, Kangaroo Island, South Australia, Australia, Oceania

741-5985 - A cheetah (Acynonix jubatus) looking back, Tsavo, Kenya, East Africa, Africa

1335-51 - Bull moose (Alces alces), in snow staring back, Grand Teton National Park, Wyoming, United States of America, North America

1315-365 - A trail rider takes a photo of a horse with her smartphone back at the corral, Merritt, British Columbia, Canada, North America

832-389186 - Gosling of a Greylag goose ( anser anser) in back plumage, chick, cute, protection, sheltered, Hannover, Lower Saxony, Germany, Europe

832-388588 - Mute swan (cygnus olor), adult bird swims with chick on its back, Germany, Europe

1112-5449 - Adult olive baboon (Papio anubis) carrying juvenile on its back in Tarangire National Park, Tanzania, East Africa, Africa

1112-5420 - Adult wattled starlings (Creatophora cinerea), on the back of a wildebeest in Serengeti National Park, Tanzania, East Africa, Africa

832-388059 - Verreaux's sifaka (Propithecus verreauxi), mother with animal baby on her back, dancing, Nahampoana Reserve, South Madagascar, Madagascar, Africa

832-388058 - Verreaux's sifaka (Propithecus verreauxi), with baby animal on the back, Nahampoana Reserve, South Madagascar, Madagascar, Africa

1112-5097 - An adult black capuchin monkey (Sapajus nigritus) with youngster on its back at Iguacu Falls, Misiones Province, Argentina, South America

1174-8786 - A warthog piglet, Phacochoerus africanus, stands in short grass, ears back, Sabi Sands, Greater Kruger National Park, South Africa

1174-8783 - A pangolin, Smutsia temminckii, lies on the ground while her pup lies on her back, tongue extended out, Sabi Sands, Greater Kruger National Park, South Africa

1174-8803 - A leopard, Panthera pardus, lying down resting its head on a branch, ears back, Sabi Sands, Greater Kruger National Park, South Africa

1174-8810 - A pangolin, Smutsia temminckii, lies on the ground while her pup lies on her back, blacked out background, Sabi Sands, Greater Kruger National Park, South Africa

832-387728 - Bactrian camels (Camelus bactrianus) in Mongolian steppe, back snow-covered mountain Jargalant, Khovd Province Mongolia

832-387961 - Reef manta ray (Mobula alfredi), silhouette, swimming in blue water, back light, Great Barrier Reef, Coral Sea, Pacific Ocean, Australia, Oceania

832-387977 - Oceanic whitetip shark (Carcharhinus longimanus) from front, back light, Great Barrier Reef, Unesco World Heritage, Coral Sea, Pacific, Australia, Oceania

832-385224 - African Lion (Panthera leo), male standing in bushes, back light, Klaserie nature reserve, South Africa, Africa

832-387154 - Two Live sharksuckers (Echeneis naucrates) on shield, back of sea turtle, Red Sea, Egypt, Africa

832-385706 - Black Skimmer (Rynchops niger) in flight fishing, crocodile in the back, Pantanal, Mato Grosso do Sul, Brazil, South America

832-385368 - Red-billed oxpecker (Buphagus erythrorhynchus), adult, stands on zebra, host animal, symbiosis, Addo Elephant National Park, Eastern Cape, South Africa, Africa

832-387705 - Common Octopus (Octopus vulgaris), sitting on hard coral, back light, sun, Indian Ocean, Maldives, Asia

1116-47487 - Two yellow-billed oxpecker (Buphagus africanus) clinging to Masai giraffe (Giraffa camelopardalis tippelskirchii), Serengeti National Park, Tanzania

1116-47828 - Close-up of leopard (Panthera pardus) lying on lichen-covered branch looking back, Maasai Mara National Reserve, Kenya

1116-48487 - Polar bear (Ursus maritimus) sitting in the snow at sunset looking back towards the camera, Churchill, Manitoba, Canada

1116-47496 - Close-up of lioness (Panthera leo) on back with suckling cub, Serengeti National Park, Tanzania

1116-48481 - Polar bear (Ursus maritimus) playing with a stick in the snow, Churchill, Manitoba, Canada

1116-48483 - Polar bear (Ursus maritimus) playing with a stick in the snow, Churchill, Manitoba, Canada

1116-47578 - Northern Hawk Owl (Surnia ulula), has just made a vole kill and is about to fly back to a perch to consume it. Grass piece has been removed from face. Owl looks at camera. South-central Alaska, Anchorage, Alaska, United States of America

1116-47920 - Cheetah cub (Acinonyx jubatus) pulls back another climbing tree, Maasai Mara National Reserve, Kenya

1116-47847 - Endangered Hawaiian Green Sea Turtle (Chelonia mydas) making it's way back to the ocean, Maui, Hawaii, United States of America

1116-47829 - Eland (Taurotragus oryx) stands in long grass looking back over shoulder, Maasai Mara National Reserve, Kenya

1116-48485 - Polar bear (Ursus maritimus) lying down playing in the snow, Churchill, Manitoba, Canada

1116-48482 - Polar bear (Ursus maritimus) upside down playing in the snow, Churchill, Manitoba, Canada

1116-47593 - Large bull Muskox (Ovibos moschatus) in winter snowstorm, captive in Alaska Wildlife Conservation Center, South-central Alaska, Portage, Alaska, United States of America