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Two-headed giraffes! Phantom impala! Man-eating whales!

See how chance timing and spontaneous camera work has turned these mind-bending nature photographs into tricks of the eye...
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Giraffes {Giraffa camelopardalis}, Etosha NP, Namibia  -  Tony Heald
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Tony Heald / Giraffes {Giraffa camelopardalis}, Etosha NP, Namibia
Two Chinstrap penguins (Pygoscelis antarcticus) climbing to rookery in spring, looking like one penguin with two sets of wings, Antarctica.  -  Klein & Hubert
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Klein & Hubert / Two Chinstrap penguins (Pygoscelis antarcticus) climbing to rookery in spring, looking like one penguin with two sets of wings, Antarctica.
Two male Indian Wild Asses (Equus hemionus khur), looking like they share a single head, Little Rann of Kutch, Gujarat, SW India.  -  Dr. Gertrud Neumann-Denzau
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Dr. Gertrud Neumann-Denzau / Two male Indian Wild Asses (Equus hemionus khur), looking like they share a single head, Little Rann of Kutch, Gujarat, SW India.
Impala (Aepyceros melampus) male at waterhole, with reflection of another male creating an optical illusion, Etosha National Park, Namibia  -  Yva Momatiuk & John Eastcott
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Yva Momatiuk & John Eastcott / Impala (Aepyceros melampus) male at waterhole, with reflection of another male creating an optical illusion, Etosha National Park, Namibia
Impala (Aepyceros melampus) females drinking at waterhole in dry season, with reflection of male creating an optical illusion, Etosha National Park, Namibia  -  Yva Momatiuk & John Eastcott
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Yva Momatiuk & John Eastcott / Impala (Aepyceros melampus) females drinking at waterhole in dry season, with reflection of male creating an optical illusion, Etosha National Park, Namibia
Bull Elephant seal (Mirounga sp) portrait with penguin walking along beach, St Andrews Bay, South Georgia  -  Michael Pitts
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Michael Pitts / Bull Elephant seal (Mirounga sp) portrait with penguin walking along beach, St Andrews Bay, South Georgia
Collared peccaries (Tayassu tajacu) interacting, two looking like one, Hidalgo Lower Rio Grande Valley, Texas, USA. (non-ex)  -  David Welling
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David Welling / Collared peccaries (Tayassu tajacu) interacting, two looking like one, Hidalgo Lower Rio Grande Valley, Texas, USA. (non-ex)
Humpback whale (Megaptera novaeangliae) breaching in front of boat carrying tourists. Monterey Bay, California, USA.  -  Diane McAllister
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Diane McAllister / Humpback whale (Megaptera novaeangliae) breaching in front of boat carrying tourists. Monterey Bay, California, USA.
Red-headed Rock Agama (Agama agama) male jumping onto rock, native to Africa, San Diego Zoo, California  -  ZSSD
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ZSSD / Red-headed Rock Agama (Agama agama) male jumping onto rock, native to Africa, San Diego Zoo, California
Dracula Orchid (Dracula benedictii) flower, Las Orquideas Natural National Park, Colombia  -  Thomas Marent
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Thomas Marent / Dracula Orchid (Dracula benedictii) flower, Las Orquideas Natural National Park, Colombia
Piping Plover (Charadrius melodus) parent sheltering chicks, Massachusetts  -  Michael Milicia/ BIA
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Michael Milicia/ BIA / Piping Plover (Charadrius melodus) parent sheltering chicks, Massachusetts
African savannah elephant (Loxodonta africana) hidden behind bush, trunk and tail visible, Marataba Private Reserve, Marakele National Park, Limpopo, South Africa  -  Staffan Widstrand
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Staffan Widstrand / African savannah elephant (Loxodonta africana) hidden behind bush, trunk and tail visible, Marataba Private Reserve, Marakele National Park, Limpopo, South Africa
Water Boatman (Notonecta glauca) with reflection underwater, a true bug of the Heteroptera suborder, Europe  -  Ingo Arndt
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Ingo Arndt / Water Boatman (Notonecta glauca) with reflection underwater, a true bug of the Heteroptera suborder, Europe
Two Harvest mice (Micromys minutus) investigating holes in Emmental cheese. Captive in studio.  -  Klein & Hubert
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Klein & Hubert / Two Harvest mice (Micromys minutus) investigating holes in Emmental cheese. Captive in studio.
Domestic pig (Sus scrofa domestica) sow swimming in the sea with mouth wide open and people in a zodiac. Bahamas  -  Klein & Hubert
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Klein & Hubert / Domestic pig (Sus scrofa domestica) sow swimming in the sea with mouth wide open and people in a zodiac. Bahamas
Lappet-faced vultures (Torgos tracheliotu) looking like one double-headed bird, Etosha National Park, Namibia, Africa  -  David Allemand
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David Allemand / Lappet-faced vultures (Torgos tracheliotu) looking like one double-headed bird, Etosha National Park, Namibia, Africa
Whooper swan (Cygnus cygnus), young bird feeding on water, looking like a rock in the water, Finland. Sequence 1 of 2.  -  Jussi Murtosaari
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Jussi Murtosaari / Whooper swan (Cygnus cygnus), young bird feeding on water, looking like a rock in the water, Finland. Sequence 1 of 2.
Whooper swan (Cygnus cygnus), young bird on water, head raised, Finland. Sequence 2 of 2.  -  Jussi Murtosaari
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Jussi Murtosaari / Whooper swan (Cygnus cygnus), young bird on water, head raised, Finland. Sequence 2 of 2.
Wild Alpine newt (Ichthyosaura alpestris) juvenile reflected on the water surface, Lago Nero, Pistoia, Tuscany, Italy.  -  Franco Banfi
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Franco Banfi / Wild Alpine newt (Ichthyosaura alpestris) juvenile reflected on the water surface, Lago Nero, Pistoia, Tuscany, Italy.
Snorkeller swimming with Stingless golden jellyfish (Mastigias sp.) in a landlocked marine lake in the middle of an island. Their golden colour comes from endosymbiotic algae, which provide nutrition...  -  Alex Mustard
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Alex Mustard / Snorkeller swimming with Stingless golden jellyfish (Mastigias sp.) in a landlocked marine lake in the middle of an island. Their golden colour comes from endosymbiotic algae, which provide nutrition...
California sea lions (Zalophus californianus) playing in a kelp forest off Santa Barbara Island, California, USA.  -  David  Fleetham
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David Fleetham / California sea lions (Zalophus californianus) playing in a kelp forest off Santa Barbara Island, California, USA.
Stoat (Mustela erminea) feeding on fish hanging from wire. In white winter coat. Vauldalen, Sor-Trondelag, Norway. April  -  Orsolya Haarberg,Orsolya  Haarberg
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Orsolya Haarberg,Orsolya Haarberg / Stoat (Mustela erminea) feeding on fish hanging from wire. In white winter coat. Vauldalen, Sor-Trondelag, Norway. April
Emperor penguin (Aptenodytes forsteri) pair in courtship. Atka Bay, Antarctica. May.  -  Stefan Christmann
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair in courtship. Atka Bay, Antarctica. May.
Two Chamois (Rupicapra rupicapra) in snow, Gran Paradiso National Park, Italy.  -  Eric Dragesco
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Eric Dragesco / Two Chamois (Rupicapra rupicapra) in snow, Gran Paradiso National Park, Italy.
Blue footed booby (Sula nebouxii) watching chick, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico.  -  Claudio Contreras
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Claudio Contreras / Blue footed booby (Sula nebouxii) watching chick, Isabel Island National Park, Sea of Cortez (Gulf of California) Mexico.
Taiwan blue magpie, (Urocissa caerulea), in Taipeh, Taiwan, endemic species  -  Staffan Widstrand / Wild Wonders of China
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Staffan Widstrand / Wild Wonders of China / Taiwan blue magpie, (Urocissa caerulea), in Taipeh, Taiwan, endemic species
Sphinx hawk moth (Hemeroplanes triptolemus) caterpillar, snake mimic species, Amarakaeri Communal Reserve, Maijuna, Rio Napo, Peru  -  Mark  Bowler
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Mark Bowler / Sphinx hawk moth (Hemeroplanes triptolemus) caterpillar, snake mimic species, Amarakaeri Communal Reserve, Maijuna, Rio Napo, Peru
Sphinx hawk moth (Hemeroplanes triptolemus) caterpillar, snake mimic species, Amarakaeri Communal Reserve, Maijuna, Rio Napo, Peru  -  Mark  Bowler
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Mark Bowler / Sphinx hawk moth (Hemeroplanes triptolemus) caterpillar, snake mimic species, Amarakaeri Communal Reserve, Maijuna, Rio Napo, Peru
Forced perspective photo of a horse appearing to stand on a dog's back, UK.  -  Mark Taylor
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Mark Taylor / Forced perspective photo of a horse appearing to stand on a dog's back, UK.
Forced perspective photo of a young woman appearing to stand / balance on a dog's nose, UK.  -  Mark Taylor
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Mark Taylor / Forced perspective photo of a young woman appearing to stand / balance on a dog's nose, UK.
Forced perspective photo of a giantwoman in the saltflats of Salar de Uyuni, Bolivia.  -  Maxime Aliaga
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Maxime Aliaga / Forced perspective photo of a giantwoman in the saltflats of Salar de Uyuni, Bolivia.
Forced Perspective photo of a giant in the saltflats of Salar de Uyuni, Bolivia.  -  Mark Taylor
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Mark Taylor / Forced Perspective photo of a giant in the saltflats of Salar de Uyuni, Bolivia.
South African / Cape giraffe (Giraffa camelopardalis giraffa), two males necking / mock fighting, looking like a double headed animal, Zimanga Private Game Reserve, Zululand, South Africa.  -  Mary McDonald
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Mary McDonald / South African / Cape giraffe (Giraffa camelopardalis giraffa), two males necking / mock fighting, looking like a double headed animal, Zimanga Private Game Reserve, Zululand, South Africa.
Ostrich (Struthio camelus) male preening, looking headless, Samburu Reserve, Kenya, Africa  -  Konrad Wothe
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Konrad Wothe / Ostrich (Struthio camelus) male preening, looking headless, Samburu Reserve, Kenya, Africa
Emperor penguin (Aptenodytes forsteri) parent feeding chick, another chick next to it looks headless, Antarctica  -  Heather Angel
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Heather Angel / Emperor penguin (Aptenodytes forsteri) parent feeding chick, another chick next to it looks headless, Antarctica
Two Reindeer (Rangifer tarandus) in snow, looking like a single double-headed animal, Norway. Captive  -  Edwin Giesbers
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Edwin Giesbers / Two Reindeer (Rangifer tarandus) in snow, looking like a single double-headed animal, Norway. Captive
Common crane (Grus grus) in flight, looking like it has two sets of wings, France. Wings of second individual visible in the background  -  Fabrice Cahez
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Fabrice Cahez / Common crane (Grus grus) in flight, looking like it has two sets of wings, France. Wings of second individual visible in the background
Green sea turtle (Chelonia mydas) swimming to take a breath, reflected in water surface. Eleuthera, Bahamas.  -  Shane Gross
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Shane Gross / Green sea turtle (Chelonia mydas) swimming to take a breath, reflected in water surface. Eleuthera, Bahamas.
Sambar (Rusa unicolor), Ranthambore National Park, Rajasthan, India. Antlers and ears of male visible behind female. Vulnerable species.  -  Sandesh  Kadur
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Sandesh Kadur / Sambar (Rusa unicolor), Ranthambore National Park, Rajasthan, India. Antlers and ears of male visible behind female. Vulnerable species.
Common backswimmer (Notonecta) reflected in the surface in its normal upside down pose. San Vito, Sardinia, Italy.  -  Alex  Mustard
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Alex Mustard / Common backswimmer (Notonecta) reflected in the surface in its normal upside down pose. San Vito, Sardinia, Italy.
Meerkat (Suricata suricatta) sunbathing at den before foraging. Kalahari Desert, Africa. (Shadow gives illusion of handcuffs).  -  Klein & Hubert
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Klein & Hubert / Meerkat (Suricata suricatta) sunbathing at den before foraging. Kalahari Desert, Africa. (Shadow gives illusion of handcuffs).
Crocodile fish (Cymbacephalus beauforti) camouflaged, Egypt, Red Sea.  -  Brandon Cole
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Brandon Cole / Crocodile fish (Cymbacephalus beauforti) camouflaged, Egypt, Red Sea.
Road with mirage, El Vizcaino Biosphere Reserve, Mexico  -  Cyril Ruoso
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Cyril Ruoso / Road with mirage, El Vizcaino Biosphere Reserve, Mexico
Iceberg formation resembling a frosted human face. Antarctica.  -  Jeff Vanuga
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Jeff Vanuga / Iceberg formation resembling a frosted human face. Antarctica.
Rock that is face shapped, Western Cape, South Africa  -  Richard Du Toit
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Richard Du Toit / Rock that is face shapped, Western Cape, South Africa