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Masai giraffe (Giraffa camelopardalis tippelskirchi) two silhouetted at sunrise, Maasai Mara Game Reserve, Kenya. - Denis-Huot
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Denis-Huot / Masai giraffe (Giraffa camelopardalis tippelskirchi) two silhouetted at sunrise, Maasai Mara Game Reserve, Kenya.
Three Ethiopian wolf (Canis simensis) pups waiting for their parents to return, Ethiopia. - Will Burrard-Lucas
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Will Burrard-Lucas / Three Ethiopian wolf (Canis simensis) pups waiting for their parents to return, Ethiopia.
Cross-Section of Utah Septarian Nodule, Utah. A type of geode, Utah Septarian Nodules are found about 15 miles east of Zion National park. They were formed in an ancient sea floor during the Cretaceou... - John Cancalosi
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John Cancalosi / Cross-Section of Utah Septarian Nodule, Utah. A type of geode, Utah Septarian Nodules are found about 15 miles east of Zion National park. They were formed in an ancient sea floor during the Cretaceou...
Silhouette of a Green Sea Turtle (Chelonia mydas) passes overhead. West Maui, Hawaii. - David Fleetham
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David Fleetham / Silhouette of a Green Sea Turtle (Chelonia mydas) passes overhead. West Maui, Hawaii.
Silhouetted Grizzly Bear (Ursus arctos horribilis) walking. Katmai, Alaska, USA, September. - Andy Rouse
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Andy Rouse / Silhouetted Grizzly Bear (Ursus arctos horribilis) walking. Katmai, Alaska, USA, September.
Mountain hare (Lepus timidus) breath backlit during cold night, Vauldalen, Norway May - Erlend Haarberg
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Erlend Haarberg / Mountain hare (Lepus timidus) breath backlit during cold night, Vauldalen, Norway May
Red deer (Cervus elaphus) male stag silhouetted at dusk, rut season, Jura, Scotland, UK, September - Loic  Poidevin
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Loic Poidevin / Red deer (Cervus elaphus) male stag silhouetted at dusk, rut season, Jura, Scotland, UK, September
Giant frogfish (Antennarius commersoni) silhouetted against sea surface from below, Ambon, Indonesia. - Tony Wu
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Tony Wu / Giant frogfish (Antennarius commersoni) silhouetted against sea surface from below, Ambon, Indonesia.
The history of life, proposed by  Swiss-American naturalist Louis Agassiz. Agassiz would disagree strongly with Darwin's theory of evolution. This diagram from 1855 shows how he understood biological... - Paul  D Stewart
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Paul D Stewart / The history of life, proposed by Swiss-American naturalist Louis Agassiz. Agassiz would disagree strongly with Darwin's theory of evolution. This diagram from 1855 shows how he understood biological...
Giant manta ray (Manta birostris) seen from above, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico - Franco  Banfi
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Franco Banfi / Giant manta ray (Manta birostris) seen from above, Revillagigedo Archipelago Biosphere Reserve, Socorro Islands, Western Mexico
Norway maple (Acer platanoides) seeds on lightbox, Ringwood, Hampshire, UK October - Mike Read
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Mike Read / Norway maple (Acer platanoides) seeds on lightbox, Ringwood, Hampshire, UK October
Eurasian Eagle owl (Bubo bubo) silhouetted at dawn, perched on rocky outcrop. Southern Norway. August. - Andy Trowbridge
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Andy Trowbridge / Eurasian Eagle owl (Bubo bubo) silhouetted at dawn, perched on rocky outcrop. Southern Norway. August.
Masai giraffe (Giraffa camelopardalis tippelskirchi) two on horizon at sunrise, Maasai Mara Game Reserve, Kenya - Denis-Huot
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Denis-Huot / Masai giraffe (Giraffa camelopardalis tippelskirchi) two on horizon at sunrise, Maasai Mara Game Reserve, Kenya
Masai giraffe (Giraffa camelopardalis tippelskirchi) group on horizon at sunrise, Maasai Mara Game Reserve, Kenya - Denis-Huot
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Denis-Huot / Masai giraffe (Giraffa camelopardalis tippelskirchi) group on horizon at sunrise, Maasai Mara Game Reserve, Kenya
Rock paintings of Rhinoceros, Tsodilo hills UNESCO World Heritage Site, Botswana. - Steve O. Taylor (GHF)
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Steve O. Taylor (GHF) / Rock paintings of Rhinoceros, Tsodilo hills UNESCO World Heritage Site, Botswana.
Shadow of person with surfboard walking on beach, Durban, KwaZulu-Natal, South Africa, August, 2009. - Rhonda Klevansky
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Rhonda Klevansky / Shadow of person with surfboard walking on beach, Durban, KwaZulu-Natal, South Africa, August, 2009.
Aerial view of Hardy Reef, Great Barrier Reef, Queensland, Australia, December 2010. - Ingo Arndt
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Ingo Arndt / Aerial view of Hardy Reef, Great Barrier Reef, Queensland, Australia, December 2010.
Laysan Albatross (Phoebastria immutabilis) flying at sunset, Midway Atoll National Wildlife Refuge, Hawaii, USA. - Visuals Unlimited
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Visuals Unlimited / Laysan Albatross (Phoebastria immutabilis) flying at sunset, Midway Atoll National Wildlife Refuge, Hawaii, USA.
African Lion (Panthera leo) outline of female, Masai Mara, Kenya - Andy Rouse
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Andy Rouse / African Lion (Panthera leo) outline of female, Masai Mara, Kenya
Ringtail Lemur (Lemur catta) jumping between branches in silhouette. Madagascar. - Andy  Rouse
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Andy Rouse / Ringtail Lemur (Lemur catta) jumping between branches in silhouette. Madagascar.
Aerial view of Hardy Reef, Great Barrier Reef, August 2011 - Jurgen Freund
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Jurgen Freund / Aerial view of Hardy Reef, Great Barrier Reef, August 2011
Holm oak (Quercus ilex) in Dehesa landscape at sunset, Campanarios de Azaiba Reserve, Salamanca Region, Castilla y Leon, Spain, May 2011 - Wild Wonders of Europe / Widstrand
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Wild Wonders of Europe / Widstrand / Holm oak (Quercus ilex) in Dehesa landscape at sunset, Campanarios de Azaiba Reserve, Salamanca Region, Castilla y Leon, Spain, May 2011
Sea stacks at Reynisdrangar at dusk, Iceland. - Peter Cairns
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Peter Cairns / Sea stacks at Reynisdrangar at dusk, Iceland.
Sea stacks at Reynisdrangar at dusk, Iceland. - Peter Cairns
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Peter Cairns / Sea stacks at Reynisdrangar at dusk, Iceland.
The parched home of a Samburu manyatta outlines the shape of the African continent from the air. The worst drought (2008-2009) in more than a decade killed most of the Samburu tribeman's livestock and... - Lisa Hoffner
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Lisa Hoffner / The parched home of a Samburu manyatta outlines the shape of the African continent from the air. The worst drought (2008-2009) in more than a decade killed most of the Samburu tribeman's livestock and...
Illustration of Madagascan Pipevine Swallowtail (Pharmacophagus antenor / Batthus philenor, Drury 1773). Strong late 18th Century illustration with contemporary colouring following its discovery. As a... - Paul D Stewart
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Paul D Stewart / Illustration of Madagascan Pipevine Swallowtail (Pharmacophagus antenor / Batthus philenor, Drury 1773). Strong late 18th Century illustration with contemporary colouring following its discovery. As a...
Illustration with later hand colouring from Thomas Burnet's 'The Sacred Theory of the Earth' 1684. In it he postulates how the 'perfect' featureless earth of the creation is transformed by waters unle... - Paul D Stewart
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Paul D Stewart / Illustration with later hand colouring from Thomas Burnet's 'The Sacred Theory of the Earth' 1684. In it he postulates how the 'perfect' featureless earth of the creation is transformed by waters unle...
Illustration with later hand colouring from Thomas Burnet's 'The Sacred Theory of the Earth' 1684. In it he postulates how the 'perfect' featureless earth of the creation is transformed by waters unle... - Paul D Stewart
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Paul D Stewart / Illustration with later hand colouring from Thomas Burnet's 'The Sacred Theory of the Earth' 1684. In it he postulates how the 'perfect' featureless earth of the creation is transformed by waters unle...