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Subadult male Wild Turkey (Meleagris gallopavo) in alternate (breeding) plumage. Hidalgo County, Texas. March.
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Gerrit Vyn / Subadult male Wild Turkey (Meleagris gallopavo) in alternate (breeding) plumage. Hidalgo County, Texas. March.
Great horned owls (Bubo virginianus) roosting in an abandoned barn. Idaho, USA. February.
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Gerrit Vyn / Great horned owls (Bubo virginianus) roosting in an abandoned barn. Idaho, USA. February.
Snowy Owl (Bubo scandiacus) fluffing feathers, this image was taken during a massive increase in the range and population of snowy owls. Boundary Bay, Canada. March.
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Gerrit Vyn / Snowy Owl (Bubo scandiacus) fluffing feathers, this image was taken during a massive increase in the range and population of snowy owls. Boundary Bay, Canada. March.
Ruffed grouse (Bonasa umbellus) displaying neck "ruff". The ruff is most often displayed once a female is present. Okanogan County, Washington. April.
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Gerrit Vyn / Ruffed grouse (Bonasa umbellus) displaying neck "ruff". The ruff is most often displayed once a female is present. Okanogan County, Washington. April.
Greater snow geese (Chen caerulescens) taking flight at sunset during migration. Montezuma National Wildlife Rescue, New York, USA. March.
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Gerrit Vyn / Greater snow geese (Chen caerulescens) taking flight at sunset during migration. Montezuma National Wildlife Rescue, New York, USA. March.
Rain showers over sagebrush-steppe at the foot of the Sawtooth Mountains. Clark County, Idaho, USA, June.
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Gerrit Vyn / Rain showers over sagebrush-steppe at the foot of the Sawtooth Mountains. Clark County, Idaho, USA, June.
Pronghorns (Antilocapra americana) crawling under fence  in snow during migration, Sublette County, Wyoming, USA. March.
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Gerrit Vyn / Pronghorns (Antilocapra americana) crawling under fence in snow during migration, Sublette County, Wyoming, USA. March.
Sandhill crane (Grus canadensis) British Columbia, Canada. December.
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Gerrit Vyn / Sandhill crane (Grus canadensis) British Columbia, Canada. December.
Nene / Hawaiian goose (Branta sandvicensis) Hawaii. April. Vulnerable species.
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Gerrit Vyn / Nene / Hawaiian goose (Branta sandvicensis) Hawaii. April. Vulnerable species.
Jonah natural gas field south of Pinedale, Wyoming.
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Gerrit Vyn / Jonah natural gas field south of Pinedale, Wyoming.
Greater sage-grouse (Centrocercus urophasianus) male displaying on a lek in snow, Sublette County, Wyoming, USA. April.
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Gerrit Vyn / Greater sage-grouse (Centrocercus urophasianus) male displaying on a lek in snow, Sublette County, Wyoming, USA. April.
Dall sheep (Ovis dalli) rams head butting, one behaviour by which males establish dominance during the Autumn mating season. Denali National Park, Alaska, USA
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Gerrit Vyn / Dall sheep (Ovis dalli) rams head butting, one behaviour by which males establish dominance during the Autumn mating season. Denali National Park, Alaska, USA