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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...
Composite image of Fireflies synchronize display just after first shower of monsoon, on moonless night. India. - Yashpal Rathore
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Yashpal Rathore / Composite image of Fireflies synchronize display just after first shower of monsoon, on moonless night. India.
Budgerigars (Melopsittacus undulatus) flocking to find water, Northern Territory, Australia - Paul Williams
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Paul Williams / Budgerigars (Melopsittacus undulatus) flocking to find water, Northern Territory, Australia
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.
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...
Head portrait of young domestic Landrace pig (Sus scrofa domesticus), organic open air breeding, Germany. - Klein & Hubert
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Klein & Hubert / Head portrait of young domestic Landrace pig (Sus scrofa domesticus), organic open air breeding, Germany.
Organic free range domestic Landrace pig (Sus scrofa domesticus) running in autumn pasture, Germany. - Klein & Hubert
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Klein & Hubert / Organic free range domestic Landrace pig (Sus scrofa domesticus) running in autumn pasture, Germany.
Organic free range domestic Landrace pig (Sus scrofa domesticus) running in autumn pasture, Germany. - Klein & Hubert
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Klein & Hubert / Organic free range domestic Landrace pig (Sus scrofa domesticus) running in autumn pasture, Germany.
Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April. - Bence  Mate
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Bence Mate / Great egret (Ardea alba) with green colouring near beak during breeding season, Lake Csaj, Pusztaszer, Hungary, April.
African elephant (Loxodonta africana) herd with calves, walking in procession to a waterhole in sand  storm, Etosha National Park, Namibia, Africa - Eric Baccega
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Eric Baccega / African elephant (Loxodonta africana) herd with calves, walking in procession to a waterhole in sand storm, Etosha National Park, Namibia, Africa
Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA, August 2015. Long exposure with lightning trigger. - Jack Dykinga
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Jack Dykinga / Lightning storm with rainbow over Saguaro cactus (Carnegiea gigantea) Avra Valley, Saguaro National Park, Tucson Mountains, Arizona, USA, August 2015. Long exposure with lightning trigger.
Great crested grebe (Podiceps cristatus cristatus) rival males fighting during mating season, Cardiff, UK, March. - Andy  Rouse
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Andy Rouse / Great crested grebe (Podiceps cristatus cristatus) rival males fighting during mating season, Cardiff, UK, March.
Firefly squid (Watasenia scintillans) close to beach during mating season. Toyama Bay, Japan. - Mark  MacEwen
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Mark MacEwen / Firefly squid (Watasenia scintillans) close to beach during mating season. Toyama Bay, Japan.
Masai giraffe (Giraffa cameleopardalis tippelskirchi) herd walking across savanna in dry season, Masai-Mara Game Reserve, Kenya - Denis-Huot
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Denis-Huot / Masai giraffe (Giraffa cameleopardalis tippelskirchi) herd walking across savanna in dry season, Masai-Mara Game Reserve, Kenya
Polar Bear (Ursus maritimus) sitting in field of fireweed, Arctic - Mitsuaki Iwago
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Mitsuaki Iwago / Polar Bear (Ursus maritimus) sitting in field of fireweed, Arctic
Autumn in the Ogilvie Mountains and boreal forest near the Dempster Highway, Yukon, Canada - Theo Allofs
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Theo Allofs / Autumn in the Ogilvie Mountains and boreal forest near the Dempster Highway, Yukon, Canada
Large icebergs at midnight, end of June, mid-summer night, Greenland - Theo Allofs
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Theo Allofs / Large icebergs at midnight, end of June, mid-summer night, Greenland
Bengal Tiger (Panthera tigris tigris) 11 months old cub walking on rocky ledge in front of red cliff, April, dry season, Bandhavgarh National Park, India - Theo Allofs
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Theo Allofs / Bengal Tiger (Panthera tigris tigris) 11 months old cub walking on rocky ledge in front of red cliff, April, dry season, Bandhavgarh National Park, India
Burchell's Zebra (Equus burchellii) herd crossing pan during summer dry season, Makgadikgadi Salt Pans, Botswana - Richard Du Toit
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Richard Du Toit / Burchell's Zebra (Equus burchellii) herd crossing pan during summer dry season, Makgadikgadi Salt Pans, Botswana
Common Sunflower (Helianthus annuus) field, Bourgogne, France - Cyril Ruoso
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Cyril Ruoso / Common Sunflower (Helianthus annuus) field, Bourgogne, France
Common Sunflower (Helianthus annuus) field, Bourgogne, France - Cyril Ruoso
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Cyril Ruoso / Common Sunflower (Helianthus annuus) field, Bourgogne, France
Red Deer (Cervus elaphus) stag bugling during autumn rutting season, Denmark - Cyril Ruoso
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Cyril Ruoso / Red Deer (Cervus elaphus) stag bugling during autumn rutting season, Denmark
Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France - Cyril Ruoso
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Cyril Ruoso / Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France
Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France - Cyril Ruoso
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Cyril Ruoso / Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France
Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France - Cyril Ruoso
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Cyril Ruoso / Alpine Ibex (Capra ibex) adult male standing in snowy mountains, Alps, France
Barbary Macaque (Macaca sylvanus) male with infant in snow-covered tree, winter, Middle Atlas Mountains, Morocco - Cyril Ruoso
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Cyril Ruoso / Barbary Macaque (Macaca sylvanus) male with infant in snow-covered tree, winter, Middle Atlas Mountains, Morocco
Barbary Macaque (Macaca sylvanus) infant riding on the back of an adult male, winter, Middle Atlas Mountains, Morocco - Cyril Ruoso
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Cyril Ruoso / Barbary Macaque (Macaca sylvanus) infant riding on the back of an adult male, winter, Middle Atlas Mountains, Morocco
Bobcat (Lynx rufus) walking in the snow, bobbed tail visible, Kalispell, Montana - Matthias Breiter
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Matthias Breiter / Bobcat (Lynx rufus) walking in the snow, bobbed tail visible, Kalispell, Montana
Mountain Lion (Puma concolor) in the snow, Kalispell, Montana - Matthias Breiter
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Matthias Breiter / Mountain Lion (Puma concolor) in the snow, Kalispell, Montana
California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers,super bloom, Antelope Valley, California - Jeff Foott
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Jeff Foott / California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers,super bloom, Antelope Valley, California
California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers, super bloom, Antelope Valley, California - Jeff Foott
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Jeff Foott / California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers, super bloom, Antelope Valley, California
California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers,superbloom, Antelope Valley, California - Jeff Foott
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Jeff Foott / California Poppy (Eschscholzia californica) and Goldfield (Lasthenia californica) flowers,superbloom, Antelope Valley, California
Turret Arch in winter, La Sal Mountains, Arches National Park, Utah - Jeff Foott
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Jeff Foott / Turret Arch in winter, La Sal Mountains, Arches National Park, Utah
Marching Men sandstone formation, Arches National Park, Utah - Jeff Foott
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Jeff Foott / Marching Men sandstone formation, Arches National Park, Utah
Winding road and sandstone formations, La Sal Mountains, Arches National Park, Utah - Jeff Foott
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Jeff Foott / Winding road and sandstone formations, La Sal Mountains, Arches National Park, Utah
Icebergs in winter in lake, Hooker Glacier, Mount Cook, Mount Cook National Park, New Zealand - Colin Monteath/ Hedgehog House
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Colin Monteath/ Hedgehog House / Icebergs in winter in lake, Hooker Glacier, Mount Cook, Mount Cook National Park, New Zealand
Cottonwood (Populus sp) trees in autumn, Grand Staircase-Escalante National Monument, Utah - Jeff Foott
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Jeff Foott / Cottonwood (Populus sp) trees in autumn, Grand Staircase-Escalante National Monument, Utah
Mountains and river after autumn snowfall, Sunwapta River, Jasper National Park, Alberta, Canada - Jeff Foott
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Jeff Foott / Mountains and river after autumn snowfall, Sunwapta River, Jasper National Park, Alberta, Canada
Mixed coniferous and deciduous forest after snowfall in autumn, Wells Gray Provincial Park, British Columbia, Canada - Jeff Foott
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Jeff Foott / Mixed coniferous and deciduous forest after snowfall in autumn, Wells Gray Provincial Park, British Columbia, Canada
Waterfall after autumn snowfall, Tangle Creek Falls, Jasper National Park, Alberta, Canada - Jeff Foott
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Jeff Foott / Waterfall after autumn snowfall, Tangle Creek Falls, Jasper National Park, Alberta, Canada
Waterfall after autumn snowfall, Tangle Creek Falls, Jasper National Park, Alberta, Canada - Jeff Foott
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Jeff Foott / Waterfall after autumn snowfall, Tangle Creek Falls, Jasper National Park, Alberta, Canada
Fremont Cottonwood (Populus fremontii) trees in autumn, Bentonite Hills, Capitol Reef National Park, Utah - Jeff Foott
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Jeff Foott / Fremont Cottonwood (Populus fremontii) trees in autumn, Bentonite Hills, Capitol Reef National Park, Utah
Waterfall in winter, Horsetail Fall, Yosemite National Park, California - Jeff Foott
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Jeff Foott / Waterfall in winter, Horsetail Fall, Yosemite National Park, California
Spring run-off, Cascade Creek, Yosemite National Park, California - Jeff Foott
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Jeff Foott / Spring run-off, Cascade Creek, Yosemite National Park, California
Waterfall in winter, Lower Yosemite Falls, Yosemite National Park, California - Jeff Foott
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Jeff Foott / Waterfall in winter, Lower Yosemite Falls, Yosemite National Park, California
Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana - Donald M. Jones
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Donald M. Jones / Northern Pintail (Anas acuta) males flying with female in spring courtship display, Montana
Black-capped Chickadee (Poecile atricapillus) in winter, Troy, Montana - Donald M. Jones
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Donald M. Jones / Black-capped Chickadee (Poecile atricapillus) in winter, Troy, Montana
Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada - Donald M. Jones
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Donald M. Jones / Bighorn Sheep (Ovis canadensis) female and male in winter, Jasper National Park, Alberta, Canada
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