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    • Aggression
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Ibex (Capra Ibex) fighting, Aiguilles Rouges National Nature Reserve, Haute-Savoie, France, June - Benjamin Barthelemy,Benjamin  Barthelemy
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Benjamin Barthelemy,Benjamin Barthelemy / Ibex (Capra Ibex) fighting, Aiguilles Rouges National Nature Reserve, Haute-Savoie, France, June
Bombardier Beetle (Pheropsophus jessoensis) protecting itself by ejecting a boiling, noxious chemical spray, Nagasaki, Japan. - Nature Production
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Nature Production / Bombardier Beetle (Pheropsophus jessoensis) protecting itself by ejecting a boiling, noxious chemical spray, Nagasaki, Japan.
Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS,  GDT 2011 competition - Ole Jorgen Liodden
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Ole Jorgen Liodden / Arctic tern (Sterna paradisaea) attacking an Arctic Fox (Vulpes / Alopex lagopus) protecting its nest site, Spitsbergen, Svalbard, Norway. Highly commended, MAMMALS, GDT 2011 competition
Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate... - John Chan
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John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...
Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October. - Marie  Read
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Marie Read / Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October.
Mustang stallion kicking out after winning fight. Rocky Mountains, USA, June. - Klein & Hubert
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Klein & Hubert / Mustang stallion kicking out after winning fight. Rocky Mountains, USA, June.
Emperor penguin (Aptenodytes forsteri), two adults brooding chicks. One chick exhibiting aggression towards other. Atka Bay, Antarctica. September. - Stefan Christmann
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two adults brooding chicks. One chick exhibiting aggression towards other. Atka Bay, Antarctica. September.
Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks brooding on parents' feet, one vocalising. Atka Bay, Antarctica. September. - Stefan Christmann
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Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks brooding on parents' feet, one vocalising. Atka Bay, Antarctica. September.
Mozambique spitting cobra (Naja mossambica) spitting venom. Kruger, South Africa. Controlled conditions. - Guy Edwardes
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Guy Edwardes / Mozambique spitting cobra (Naja mossambica) spitting venom. Kruger, South Africa. Controlled conditions.
Pere David's deer / Milu (Elaphurus davidianus), two stags testing their strength in Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China - Staffan Widstrand / Wild Wonders of China
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Staffan Widstrand / Wild Wonders of China / Pere David's deer / Milu (Elaphurus davidianus), two stags testing their strength in Hubei Tian'ezhou Milu National Nature Reserve, Shishou, Hubei, China
Group of Griffon vultures (Gyps fulvus) fighting to feed on a dead lamb. Cuenca, Spain, August. - David Perpinan
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David Perpinan / Group of Griffon vultures (Gyps fulvus) fighting to feed on a dead lamb. Cuenca, Spain, August.
Grey heron (Ardea cinerea) chick trying to force its parent to regurgitate food, with another chick leaning in, chased away by adult, Barcelona, Spain, May. - David Perpinan
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David Perpinan / Grey heron (Ardea cinerea) chick trying to force its parent to regurgitate food, with another chick leaning in, chased away by adult, Barcelona, Spain, May.
Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica. - Paul Hobson
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Paul Hobson / Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica.
Red fox (Vulpes vulpes), two cubs play fighting. Sheffield, England, UK. May. - Paul Hobson
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Paul Hobson / Red fox (Vulpes vulpes), two cubs play fighting. Sheffield, England, UK. May.
Jay (Garrulus glandarius), two fighting in mid-air with another observing. Norway. October. - Markus Varesvuo
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Markus Varesvuo / Jay (Garrulus glandarius), two fighting in mid-air with another observing. Norway. October.
Two Black-bellied hamsters (Cricetus cricetus) fighting, Vienna, Austria, October. - Kerstin  Hinze
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Kerstin Hinze / Two Black-bellied hamsters (Cricetus cricetus) fighting, Vienna, Austria, October.
RF- White-necked Jacobin hummingbird (Florisuga mellivora) hovering with tail erect to show aggression , Tobago (This image may be licensed either as rights managed or royalty free.) - Andy Rouse
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Andy Rouse / RF- White-necked Jacobin hummingbird (Florisuga mellivora) hovering with tail erect to show aggression , Tobago (This image may be licensed either as rights managed or royalty free.)
Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica. - Franco  Banfi
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Franco Banfi / Sperm whale (Physeter macrocephalus) young male trying to copulate with a female. The calf of the female was in the way so the male is trying to chase it away. Dominica.
Brown bear (Ursus arctos), two showing aggression at night. Finland. August. - Pal Hermansen
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Pal Hermansen / Brown bear (Ursus arctos), two showing aggression at night. Finland. August.
Hippopotamus (Hippopotamus amphibius) charging in Luangwa river, close up of mouth and teeth, Zambia - Klein & Hubert
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Klein & Hubert / Hippopotamus (Hippopotamus amphibius) charging in Luangwa river, close up of mouth and teeth, Zambia
Two Lynx (Lynx lynx) kittens play fighting in front of den entrance, Bavarian Forest National Park, Germany, October. Captive. - Philippe Clement
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Philippe Clement / Two Lynx (Lynx lynx) kittens play fighting in front of den entrance, Bavarian Forest National Park, Germany, October. Captive.
San Cristobal giant tortoises (Chelonoidis chatamensis), fighting, Galapaguera, San Cristobal Island, Galapagos - Tui De Roy
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Tui De Roy / San Cristobal giant tortoises (Chelonoidis chatamensis), fighting, Galapaguera, San Cristobal Island, Galapagos
Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May. - Dave Bevan
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Dave Bevan / Slow motion clip of two pairs of Jackdaws (Corvus monedula) squabbling over nest site, Worcestershire, England, UK, May.
Great white shark (Carcharodon carcharias) breaking surface with mouth open. Guadalupe Island, Mexico. - David Fleetham
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David Fleetham / Great white shark (Carcharodon carcharias) breaking surface with mouth open. Guadalupe Island, Mexico.
Northern goshawk (Accipiter gentilis) flying with squirrel prey, Finland . March - Sergey  Gorshkov
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Sergey Gorshkov / Northern goshawk (Accipiter gentilis) flying with squirrel prey, Finland . March
Northern goshawks (Accipiter gentilis) fighting over squirrel carcass, Finland, March. - Sergey  Gorshkov
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Sergey Gorshkov / Northern goshawks (Accipiter gentilis) fighting over squirrel carcass, Finland, March.
Black Grouse (Tetrao tetrix) males fighting at lek in the snow, Tver, Russia. April - Sergey  Gorshkov
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Sergey Gorshkov / Black Grouse (Tetrao tetrix) males fighting at lek in the snow, Tver, Russia. April
Female Grey seal (Halichoerus grypus) defending pup on beach, chasing male away, Horsey, Norfolk, November. - Five Films
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Five Films / Female Grey seal (Halichoerus grypus) defending pup on beach, chasing male away, Horsey, Norfolk, November.
Juvenile male Wild boar (Sus scrofa) fighting to establish seniority, Gloucestershire, England, UK, December. - Dave Bevan
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Dave Bevan / Juvenile male Wild boar (Sus scrofa) fighting to establish seniority, Gloucestershire, England, UK, December.
Red deer (Cervus elaphus) stags fighting, Scotland, UK, May. - Philippe Clement
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Philippe Clement / Red deer (Cervus elaphus) stags fighting, Scotland, UK, May.
Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June. - Remi Masson
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Remi Masson / Pair of Pumpkinseeds (Lepomis gibbosus) mating, male chasing other individuals away, River Rhone, Rhone-Alpes, France, June.
Male Common toads (Bufo bufo) fighting underwater during mating season, with a pair mating Ain, Rhone-Alps, France, March. - Remi Masson
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Remi Masson / Male Common toads (Bufo bufo) fighting underwater during mating season, with a pair mating Ain, Rhone-Alps, France, March.
Mountain hares (Lepus timidus) fighting in snow at night, Vauldalen, Norway.  Joint overall winner of the GDT  European Wildlife Photographer of the Year 2017.  Highly commended in the Wildlife Photog... - Erlend Haarberg
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Erlend Haarberg / Mountain hares (Lepus timidus) fighting in snow at night, Vauldalen, Norway. Joint overall winner of the GDT European Wildlife Photographer of the Year 2017. Highly commended in the Wildlife Photog...
Group of Adelie penguins (Pygoscelis adeliae) destroying an egg with a chick inside, Adelie Land, Antarctica, January. - Fred  Olivier
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Fred Olivier / Group of Adelie penguins (Pygoscelis adeliae) destroying an egg with a chick inside, Adelie Land, Antarctica, January.
Brown hare (Lepus europaeus) boxing, Bedfordshire, England, UK, March. - Dave Bevan
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Dave Bevan / Brown hare (Lepus europaeus) boxing, Bedfordshire, England, UK, March.
Male Western gorilla (Gorilla gorilla) displaying, throws clump of grass into the air, runs through bai and hits other gorilla, Maya Nord Bai, Odzala-Kokoua National Park, Cuvette-Ouest Region, Republ... - Jabruson Motion
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Jabruson Motion / Male Western gorilla (Gorilla gorilla) displaying, throws clump of grass into the air, runs through bai and hits other gorilla, Maya Nord Bai, Odzala-Kokoua National Park, Cuvette-Ouest Region, Republ...
Close-up of a male Mountain gorilla (Gorilla beringei beringei) looking at camera, with another male approaching from behind, beats chest displaying, Bukima, Virunga National Park, Democratic Republic... - Jabruson Motion
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Jabruson Motion / Close-up of a male Mountain gorilla (Gorilla beringei beringei) looking at camera, with another male approaching from behind, beats chest displaying, Bukima, Virunga National Park, Democratic Republic...
Two male Grey seals (Halichoerus grypus) fighting in surf, with a female and juvenile nearby, Norfolk, England, UK. December. - Dave Bevan
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Dave Bevan / Two male Grey seals (Halichoerus grypus) fighting in surf, with a female and juvenile nearby, Norfolk, England, UK. December.
Two male Iberian wild goats (Capra pyrenaica) fighting, Sierra de Gredos, Spain, November. - Francisco Marquez
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Francisco Marquez / Two male Iberian wild goats (Capra pyrenaica) fighting, Sierra de Gredos, Spain, November.
Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016. - Sandesh  Kadur
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Sandesh Kadur / Two Bengal monitors (Varanus bengalensis) fighting, Ranthambore National Park, Rajasthan, India. 2016.
Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April. - SCOTLAND: The Big Picture
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SCOTLAND: The Big Picture / Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April.
Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April. - SCOTLAND: The Big Picture
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SCOTLAND: The Big Picture / Gannets (Morus bassanus) diving to feed on discarded fish, Shetland, Scotland, UK, April.
Two male Dusky groupers (Epinephelus marginatus) fighting for territory during mating season at 'baixa do meros', a small pinnacle at Formigas islets Protected area, near Santa Maria Island, Azores. F... - Jordi Chias
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Jordi Chias / Two male Dusky groupers (Epinephelus marginatus) fighting for territory during mating season at 'baixa do meros', a small pinnacle at Formigas islets Protected area, near Santa Maria Island, Azores. F...
Two male Alpine ibex (Capra ibex) fighting on a steep mountain rock face, Gran Paradiso National Park, Graian Alps, Italy, June. - Philippe Clement
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Philippe Clement / Two male Alpine ibex (Capra ibex) fighting on a steep mountain rock face, Gran Paradiso National Park, Graian Alps, Italy, June.
Plain's zebra (Equus quagga) biting the neck of a rival during a fight Hluhluwe imfolozi Park. South Africa. - Neil Aldridge
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Neil Aldridge / Plain's zebra (Equus quagga) biting the neck of a rival during a fight Hluhluwe imfolozi Park. South Africa.
Hippopotamus (Hippopotamus amphibius) charging through the shallows, Chobe River, Chobe National Park, Botswana. Vulnerable species. - Neil Aldridge
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Neil Aldridge / Hippopotamus (Hippopotamus amphibius) charging through the shallows, Chobe River, Chobe National Park, Botswana. Vulnerable species.
Two wild Mustang stallions fighting in the White Mountain Herd Area, Wyoming, USA. August. - Carol Walker
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Carol Walker / Two wild Mustang stallions fighting in the White Mountain Herd Area, Wyoming, USA. August.
Coastal brown bears (Ursus arctos) fighting, Lake Clarke National Park, Alaska, September - Danny Green
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Danny Green / Coastal brown bears (Ursus arctos) fighting, Lake Clarke National Park, Alaska, September
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