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Chamois (Rupicapra rupicapra) in deep snow, Gran Paradiso National Park, Italy. November. Commended in the Asferico Photography Competition 2016.
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David Pattyn / Chamois (Rupicapra rupicapra) in deep snow, Gran Paradiso National Park, Italy. November. Commended in the Asferico Photography Competition 2016.
Sun beam at sun rise over the Grand Canyon of the Yellowstone, Yelllowstone National Park, Wyoming, USA. January 2016.
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Nick Garbutt / Sun beam at sun rise over the Grand Canyon of the Yellowstone, Yelllowstone National Park, Wyoming, USA. January 2016.
Sun beam at sun rise over the Grand Canyon of the Yellowstone, Yelllowstone National Park, Wyoming, USA. January 2016
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Nick Garbutt / Sun beam at sun rise over the Grand Canyon of the Yellowstone, Yelllowstone National Park, Wyoming, USA. January 2016
North American bobcat (Lynx rufus) striding through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January
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Nick Garbutt / North American bobcat (Lynx rufus) striding through deep snow. Madison River Valley, Yellowstone National Park, Wyoming, USA. January
Demoiselle crane (Anthropoides virgo) resting on sand dunes during winter migration, Khichan, Western Rajasthan, India. March.
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Yashpal Rathore / Demoiselle crane (Anthropoides virgo) resting on sand dunes during winter migration, Khichan, Western Rajasthan, India. March.
Low angle view of Demoiselle crane (Anthropoides virgo) flying and feeding during winter migration. Khichan, Western Rajasthan, India. December.
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Yashpal Rathore / Low angle view of Demoiselle crane (Anthropoides virgo) flying and feeding during winter migration. Khichan, Western Rajasthan, India. December.
Mountain hare (Lepus timidus) three adults on a snow slope high in the Cairngorm Mountains, Cairngorms National Park, Scotland, UK, February. Finalist in the Mammals category of the  Wildlife Photogra...
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Andrew Parkinson / Mountain hare (Lepus timidus) three adults on a snow slope high in the Cairngorm Mountains, Cairngorms National Park, Scotland, UK, February. Finalist in the Mammals category of the Wildlife Photogra...
Whooper swans (Cygnus cygnus) small flock coming into land on open field in snow storm, Hokkaido Japan.
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Wim van den Heever / Whooper swans (Cygnus cygnus) small flock coming into land on open field in snow storm, Hokkaido Japan.
Golden monkey (Rhinopithecus roxellana) jumping over a frozen stream, Qinling Mountains, China. Sequence 2 of 7
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Cyril Ruoso / Golden monkey (Rhinopithecus roxellana) jumping over a frozen stream, Qinling Mountains, China. Sequence 2 of 7
Mountain hare (Lepus timidus) in white winter coat camouflaged in snow, Scotland, UK. Commended in the Asferico Competition 2016.
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Mark Hamblin / Mountain hare (Lepus timidus) in white winter coat camouflaged in snow, Scotland, UK. Commended in the Asferico Competition 2016.
Sunrise over Mt Morrison in the far distance, near Convict Lake, Sierra Nevada, California, USA January
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Floris van Breugel / Sunrise over Mt Morrison in the far distance, near Convict Lake, Sierra Nevada, California, USA January
Monarch butterflies (Danaus plexippus) over winter on Eucalyptus and Monterey Cypress trees near Pismo Beach, San Luis, California, USA December.. When temperatures warm up enough, they will embark on...
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Floris van Breugel / Monarch butterflies (Danaus plexippus) over winter on Eucalyptus and Monterey Cypress trees near Pismo Beach, San Luis, California, USA December.. When temperatures warm up enough, they will embark on...
First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
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Floris van Breugel / First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
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Floris van Breugel / First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
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Floris van Breugel / First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
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Floris van Breugel / First rays of golden sunshine hit Giant Sequoias (Sequoiadendron giganteum) covered in a winter blanket of snow and frost, Grant Grove, Sequoia / Kings Canyon National Park, California, USA November
Great egret (Ardea alba) group of five at water's edge, with very out of focus egret in foreground. Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary, February.
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Bence Mate / Great egret (Ardea alba) group of five at water's edge, with very out of focus egret in foreground. Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary, February.
Two Buzzards (Buteo buteo) fighting, Lake Csaj, Kiskunsagi National Park, Hungary. February.
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Bence Mate / Two Buzzards (Buteo buteo) fighting, Lake Csaj, Kiskunsagi National Park, Hungary. February.
Great egrets (Ardea alba) in winter, and Grey heron (Ardea cinerea) with flock of other birds flying above,  Lake Csaj, Kiskunsagi National Park, Hungary. January.
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Bence Mate / Great egrets (Ardea alba) in winter, and Grey heron (Ardea cinerea) with flock of other birds flying above, Lake Csaj, Kiskunsagi National Park, Hungary. January.
White tailed sea eagle (Haliaeetus albicilla) and Hooded crow (Corvus cornix) in snow, Lake Csaj, Kiskunsagi National Park, Hungary. January.
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Bence Mate / White tailed sea eagle (Haliaeetus albicilla) and Hooded crow (Corvus cornix) in snow, Lake Csaj, Kiskunsagi National Park, Hungary. January.
One-year ice off Ellesmere island, Nunavut, Canada, August.
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Pal Hermansen / One-year ice off Ellesmere island, Nunavut, Canada, August.
European Dipper (Cinclus cinclus) on ice next to stream,  winter, Finland. February.
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Jussi Murtosaari / European Dipper (Cinclus cinclus) on ice next to stream, winter, Finland. February.
Great egret (Ardea alba) in snow, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. March.
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Bence Mate / Great egret (Ardea alba) in snow, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. March.
Grey herons  (Ardea cinerea) fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.
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Bence Mate / Grey herons (Ardea cinerea) fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.
Grey heron (Ardea cinerea) squabbling, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
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Bence Mate / Grey heron (Ardea cinerea) squabbling, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
Great egret (Ardea alba) fighting, one grabbing the leg of another in snow, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
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Bence Mate / Great egret (Ardea alba) fighting, one grabbing the leg of another in snow, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. February.
Storm waves off the coast of Praia do Norte, Nazare, Portugal. January.
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Luis Quinta / Storm waves off the coast of Praia do Norte, Nazare, Portugal. January.
Loch Beinn a Meadhoin in the mist, Inverness, Scotland, December 2013.
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Niall Benvie / Loch Beinn a Meadhoin in the mist, Inverness, Scotland, December 2013.
View up to Beech (Fagus sylvatica) woodland canopy in winter, photographed with a circular fisheye lens. Derbyshire, UK. December.
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Alex Hyde / View up to Beech (Fagus sylvatica) woodland canopy in winter, photographed with a circular fisheye lens. Derbyshire, UK. December.
Trees in Hautes Fagnes Nature Reserve in winter after snowfall. This area - Noir Flohay was burnt a few years ago and some trees are still blackened, Hautes Fagnes, Belgian Ardennes, Belgium, February...
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David Pattyn / Trees in Hautes Fagnes Nature Reserve in winter after snowfall. This area - Noir Flohay was burnt a few years ago and some trees are still blackened, Hautes Fagnes, Belgian Ardennes, Belgium, February...
Fly agaric mushrooms (Amanita muscaria) in snow,  Los Alcornocales Natural Park, Cortes de la Frontera, southern Spain, January.
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Andres M. Dominguez / Fly agaric mushrooms (Amanita muscaria) in snow, Los Alcornocales Natural Park, Cortes de la Frontera, southern Spain, January.
European stonechat (Saxicola rubicola) male perched with mountainous habitat behind, Sierra de Grazalema Natural Park, southern Spain, February.
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Andres M. Dominguez / European stonechat (Saxicola rubicola) male perched with mountainous habitat behind, Sierra de Grazalema Natural Park, southern Spain, February.
Common magpies (Pica pica) perched on frost covered branches, Jvaskyla, Finland, January.
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Jussi Murtosaari / Common magpies (Pica pica) perched on frost covered branches, Jvaskyla, Finland, January.
Fieldfare (Turdus pilaris) in Rowan tree with berries in winter, Jyvaskyla, Central Finland, January.
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Jussi Murtosaari / Fieldfare (Turdus pilaris) in Rowan tree with berries in winter, Jyvaskyla, Central Finland, January.
Frozen Elmleaf blackberry (Rubus ulmifolius) in a small pond, Sierra de Grazalema Natural Park, southern Spain, January.
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Andres M. Dominguez / Frozen Elmleaf blackberry (Rubus ulmifolius) in a small pond, Sierra de Grazalema Natural Park, southern Spain, January.
Bacteria (Lepthotryx discophora) causing iridescent patterns and White willow tree leaf (Salix alba) in river, Sierra de Grazalema Natural Park, southern Spain, November.
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Andres M. Dominguez / Bacteria (Lepthotryx discophora) causing iridescent patterns and White willow tree leaf (Salix alba) in river, Sierra de Grazalema Natural Park, southern Spain, November.
Dove's-foot crane's-bill leaf (Geranium molle) and algae in ice with air bubbles, Sierra de Grazalema Natural Park, southern Spain, February.
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Andres M. Dominguez / Dove's-foot crane's-bill leaf (Geranium molle) and algae in ice with air bubbles, Sierra de Grazalema Natural Park, southern Spain, February.
Holm oak tree (Quercus ilex) in snowfall, Sierra de Grazalema Natural Park, southern Spain, January.
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Andres M. Dominguez / Holm oak tree (Quercus ilex) in snowfall, Sierra de Grazalema Natural Park, southern Spain, January.
Leaf frozen in ice, Sierra de Grazalema Natural Park, southern Spain, February. Highly Commended in the Plants and Fungi Category of the Asferico 2016 Awards.
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Andres M. Dominguez / Leaf frozen in ice, Sierra de Grazalema Natural Park, southern Spain, February. Highly Commended in the Plants and Fungi Category of the Asferico 2016 Awards.
Ice and grass in frozen pond, Sierra de Grazalema Natural Park, southern Spain, January.
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Andres M. Dominguez / Ice and grass in frozen pond, Sierra de Grazalema Natural Park, southern Spain, January.
English oak tree (Quercus robur) in moonlight, Nauroth, Germany, February.
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Solvin Zankl / English oak tree (Quercus robur) in moonlight, Nauroth, Germany, February.
Whooper swan (Cygnus cygnus) mid flight over the frozen lake, Kussharo, Hokkaido, Japan.
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Wim van den Heever / Whooper swan (Cygnus cygnus) mid flight over the frozen lake, Kussharo, Hokkaido, Japan.
Female Black grouse (Tetrao / Lyrurus tetrix) perched in tree covered in snow, Inari Kiilopaa, Finland, January.
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Markus Varesvuo / Female Black grouse (Tetrao / Lyrurus tetrix) perched in tree covered in snow, Inari Kiilopaa, Finland, January.
Willow grouse / Ptarmigan (Lagopus lagopus) fluffed up perched in snow, Inari, Finland, February.
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Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) fluffed up perched in snow, Inari, Finland, February.
Willow grouse (lagopus lagopus) flock in flight in snow, Utsjoki, Finland, October.
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Markus Varesvuo / Willow grouse (lagopus lagopus) flock in flight in snow, Utsjoki, Finland, October.
Willow grouse / Ptarmigan (Lagopus lagopus) flying, Inari Kiilopaa, Finland, February.
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Markus Varesvuo / Willow grouse / Ptarmigan (Lagopus lagopus) flying, Inari Kiilopaa, Finland, February.
Snow covered Norway spruce (Picea abies) trees at the treeline, Stubba Nature Reserve, Laponia, Sweden, February 2013.
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Orsolya Haarberg / Snow covered Norway spruce (Picea abies) trees at the treeline, Stubba Nature Reserve, Laponia, Sweden, February 2013.
Snow covered Norway spruce (Picea abies) forest on Mount Harghita Madaras, Carpathian Mountains, Transylvania, Romania, January 2015.
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Orsolya Haarberg / Snow covered Norway spruce (Picea abies) forest on Mount Harghita Madaras, Carpathian Mountains, Transylvania, Romania, January 2015.
Norway spruce (Picea abies) trees covered in snow, Ciuc Mountains, Transylvania, Romania, January 2015.
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Orsolya Haarberg / Norway spruce (Picea abies) trees covered in snow, Ciuc Mountains, Transylvania, Romania, January 2015.
Mountain hare (Lepus timidus) backlit in snow, Vauldalen, Norway, May.
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Erlend Haarberg / Mountain hare (Lepus timidus) backlit in snow, Vauldalen, Norway, May.
Frost covered European beech tree (Fagus sylvatica) in a snow covered field framed by frosty branches, Calonda, Harghita County, Transylvania, Romania, January.
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Erlend Haarberg / Frost covered European beech tree (Fagus sylvatica) in a snow covered field framed by frosty branches, Calonda, Harghita County, Transylvania, Romania, January.
Type B Killer whale (Orca orcinus) surfacing, close-up, Antarctic Sound, Antarctic Peninsula, Antarctic, January.
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Brent Stephenson / Type B Killer whale (Orca orcinus) surfacing, close-up, Antarctic Sound, Antarctic Peninsula, Antarctic, January.
Ephydrid flies (Ephydra sp) that eat microscopic algae and survives during the winter in thermal pools. Biscut Basin, Yellowstone National Park, Wyoming, USA, January.
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Jeff Vanuga / Ephydrid flies (Ephydra sp) that eat microscopic algae and survives during the winter in thermal pools. Biscut Basin, Yellowstone National Park, Wyoming, USA, January.
Old Faithful Geyser erupting at -30 Celsius in winter.  Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.
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Jeff Vanuga / Old Faithful Geyser erupting at -30 Celsius in winter. Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2015.
Adelie penguin (Pygoscelis adeliae) courtship behaviour. Prydz Bay, near Davis Station, Vestfold Hills, Ingrid Christensen Coast, East Antarctica, November.
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Tui De Roy / Adelie penguin (Pygoscelis adeliae) courtship behaviour. Prydz Bay, near Davis Station, Vestfold Hills, Ingrid Christensen Coast, East Antarctica, November.
Emperor penguin (Aptenodytes forsteri) chicks, Amanda Bay, Prydz Bay, Ingrid Christensen Coast, East Antarctica, November.
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Tui De Roy / Emperor penguin (Aptenodytes forsteri) chicks, Amanda Bay, Prydz Bay, Ingrid Christensen Coast, East Antarctica, November.
Wandering albatross (Diomedea exulans) flying off coast of South Georgia Island.
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Chris & Monique Fallows / Wandering albatross (Diomedea exulans) flying off coast of South Georgia Island.
Ice patterns on lake, Sorvagen, Moskenes, Lofoten, Nordland, Norway, January.
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Erlend Haarberg / Ice patterns on lake, Sorvagen, Moskenes, Lofoten, Nordland, Norway, January.
Mountain hare (Lepus timidus), Cairngorms National Park, Scotland. January.
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Alex Hyde / Mountain hare (Lepus timidus), Cairngorms National Park, Scotland. January.
Red deer herd (Cervus elaphus) moving over mountain ridge in heavy snow. Cairngorms National Park, Scotland. January.
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Alex Hyde / Red deer herd (Cervus elaphus) moving over mountain ridge in heavy snow. Cairngorms National Park, Scotland. January.
Mountain hare (Lepus timidus) on snow, Cairngorms National Park, Scotland. January.
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Alex Hyde / Mountain hare (Lepus timidus) on snow, Cairngorms National Park, Scotland. January.
Spider (Tegenaria sp.) in dew-covered web in limestone cave, Plitvice Lakes National Park, Croatia. January.
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Alex Hyde / Spider (Tegenaria sp.) in dew-covered web in limestone cave, Plitvice Lakes National Park, Croatia. January.
Mountain hare (Lepus timidus) in heavy snowfall, Cairngorms National Park, Scotland. January.
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Alex Hyde / Mountain hare (Lepus timidus) in heavy snowfall, Cairngorms National Park, Scotland. January.
Mountain hare (Lepus timidus) in heavy snowfall, Cairngorms National Park, Scotland. January.
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Alex Hyde / Mountain hare (Lepus timidus) in heavy snowfall, Cairngorms National Park, Scotland. January.
Greenfinch (Carduelis chloris) pair, one perched on branch and one hovering in snowfall, Derbyshire, February.
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Ben Hall / Greenfinch (Carduelis chloris) pair, one perched on branch and one hovering in snowfall, Derbyshire, February.
Orcas (Orcinus orca) pair in sea surrounded by mountains, Iceland, January.
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Ben Hall / Orcas (Orcinus orca) pair in sea surrounded by mountains, Iceland, January.
Red fox (Vulpes vulpes) at night in snow, camera trap image, Jura Mountains, Switzerland, August.  Commended in the Mammals category of the Asferico Competition 2016.
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Laurent Geslin / Red fox (Vulpes vulpes) at night in snow, camera trap image, Jura Mountains, Switzerland, August. Commended in the Mammals category of the Asferico Competition 2016.
Four Lime trees (Tilia) in early spring, viewed from below, Fourdrinoy,  Picardy, France, March.
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Pascal Tordeux / Four Lime trees (Tilia) in early spring, viewed from below, Fourdrinoy, Picardy, France, March.
Col du Bonhomme in snow, Vosges Mountains Alsace, France, February 2016.
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Pascal Tordeux / Col du Bonhomme in snow, Vosges Mountains Alsace, France, February 2016.
White-tailed deer (Odocoileus virginianus) with snowman, New York, USA. February 2015.
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John Cancalosi / White-tailed deer (Odocoileus virginianus) with snowman, New York, USA. February 2015.
White-tailed deer (Odocoileus virginianus) with snowman, New York, USA.
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John Cancalosi / White-tailed deer (Odocoileus virginianus) with snowman, New York, USA.
White-tailed deer (Odocoileus virginianus) with snowman, New York, USA.
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John Cancalosi / White-tailed deer (Odocoileus virginianus) with snowman, New York, USA.
Mute swans (Cygnus olor) swimming on frosty winter morning. Loch Awe,  Argyll and Bute, Scotland, UK, December 2010.
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SCOTLAND: The Big Picture / Mute swans (Cygnus olor) swimming on frosty winter morning. Loch Awe, Argyll and Bute, Scotland, UK, December 2010.
Black-bellied plover (Pluvialis squaterola) in winter plumage, feeding along tideline. Sanibel, Florida, USA, March.
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Melvin Grey / Black-bellied plover (Pluvialis squaterola) in winter plumage, feeding along tideline. Sanibel, Florida, USA, March.
Whooper Swan (Cygnus cygnus) with snowy mountains behind, Loch Etive, Agyll and Bute, Scotland, UK, March. Small repro only.
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SCOTLAND: The Big Picture / Whooper Swan (Cygnus cygnus) with snowy mountains behind, Loch Etive, Agyll and Bute, Scotland, UK, March. Small repro only.
Wren (Troglodytes troglodytes) on frost covered fern, Dunham Massey, Cheshire, UK. Winner of the Habitat Category of the British Wildlife Photographer of the Year Awards (BWPA) 2017.
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Ben Hall / Wren (Troglodytes troglodytes) on frost covered fern, Dunham Massey, Cheshire, UK. Winner of the Habitat Category of the British Wildlife Photographer of the Year Awards (BWPA) 2017.
RF - Herd of American Bison (Bison bison) around geo-thermal features. Firehole River Valley. Yellowstone National Park, Wyoming, USA. January 2008. (This image may be licensed either as rights manage...
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Nick Garbutt / RF - Herd of American Bison (Bison bison) around geo-thermal features. Firehole River Valley. Yellowstone National Park, Wyoming, USA. January 2008. (This image may be licensed either as rights manage...
RF - Rocky Mountain bighorn sheep (Ovis canadensis canadensis) searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed eith...
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Nick Garbutt / RF - Rocky Mountain bighorn sheep (Ovis canadensis canadensis) searching for grazing beneath deep snow. Lamar Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed eith...
RF - Moon beam  created by reflections from ice crystals in air, at full moon over Grand Canyon, Yelllowstone National Park, Wyoming, USA. January 2016. (This image may be licensed either as rights ma...
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Nick Garbutt / RF - Moon beam created by reflections from ice crystals in air, at full moon over Grand Canyon, Yelllowstone National Park, Wyoming, USA. January 2016. (This image may be licensed either as rights ma...
RF - Sun beam created by reflections from ice crystals in air at sun rise over Grand Canyon, Yelllowstone National Park, Wyoming, USA. January 2016. (This image may be licensed either as rights manage...
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Nick Garbutt / RF - Sun beam created by reflections from ice crystals in air at sun rise over Grand Canyon, Yelllowstone National Park, Wyoming, USA. January 2016. (This image may be licensed either as rights manage...
RF - North American bobcat (Lynx rufus). Madison River Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed either as rights managed or royalty free.)
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Nick Garbutt / RF - North American bobcat (Lynx rufus). Madison River Valley, Yellowstone National Park, Wyoming, USA. January. (This image may be licensed either as rights managed or royalty free.)
RF - Portrait of domestic Brittany dog on frosty grass at dawn. Canterbury, Connecticut, USA.  Late November. (This image may be licensed either as rights managed or royalty free.)
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Lynn M Stone / RF - Portrait of domestic Brittany dog on frosty grass at dawn. Canterbury, Connecticut, USA. Late November. (This image may be licensed either as rights managed or royalty free.)
RF - Domestic male Great pyrenees dog in snow. Littleton, Massachusetts, USA. February. (This image may be licensed either as rights managed or royalty free.)
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Lynn M Stone / RF - Domestic male Great pyrenees dog in snow. Littleton, Massachusetts, USA. February. (This image may be licensed either as rights managed or royalty free.)
RF - Head portrait of domestic male Great pyrenees dog in snow. Littleton, Massachusetts, USA. February. (This image may be licensed either as rights managed or royalty free.)
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Lynn M Stone / RF - Head portrait of domestic male Great pyrenees dog in snow. Littleton, Massachusetts, USA. February. (This image may be licensed either as rights managed or royalty free.)
RF - Domestic Yellow labrador retriever in snow. Clinton, Connecticut, USA. January. (This image may be licensed either as rights managed or royalty free.)
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Lynn M Stone / RF - Domestic Yellow labrador retriever in snow. Clinton, Connecticut, USA. January. (This image may be licensed either as rights managed or royalty free.)
Australasian grebe (Tachybaptus novaehollandiae) in winter plumage, swimming, Fogg Dam, Northern Territory, Australia
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Roger Powell / Australasian grebe (Tachybaptus novaehollandiae) in winter plumage, swimming, Fogg Dam, Northern Territory, Australia
Sharp-tailed sandpiper (Calidris acuminata) in winter plumage, feeding along the tideline,  Point Wilson, Port Phillip Bay, Victoria, Australia.
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Roger Powell / Sharp-tailed sandpiper (Calidris acuminata) in winter plumage, feeding along the tideline, Point Wilson, Port Phillip Bay, Victoria, Australia.
Sharp-tailed sandpiper (Calidris acuminata) in winter plumage, feeding along the tideline,  Point Wilson, Port Phillip Bay, Victoria, Australia.
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Roger Powell / Sharp-tailed sandpiper (Calidris acuminata) in winter plumage, feeding along the tideline, Point Wilson, Port Phillip Bay, Victoria, Australia.
Flock of Hoary-headed Grebes (Poliocephalus poliocephalus) in winter plumage fishing on a tidal back water. Werribee Sewerage Farm, Victoria, Australia.
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Roger Powell / Flock of Hoary-headed Grebes (Poliocephalus poliocephalus) in winter plumage fishing on a tidal back water. Werribee Sewerage Farm, Victoria, Australia.
Southern hemisphere humpback whales (Megaptera novaeangliae australis) two engaged in tail slapping together, female on left, male on right, the pair was travelling north in winter, South Africa.
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Tony Wu / Southern hemisphere humpback whales (Megaptera novaeangliae australis) two engaged in tail slapping together, female on left, male on right, the pair was travelling north in winter, South Africa.
Whooper swan (Cygnus cygnus) pair in flight in snowy landscape, Finland, November.
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Jussi Murtosaari / Whooper swan (Cygnus cygnus) pair in flight in snowy landscape, Finland, November.
Whooper swan (Cygnus cygnus), flapping wings on water, Finland, January.
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Jussi Murtosaari / Whooper swan (Cygnus cygnus), flapping wings on water, Finland, January.
Whooper swan (Cygnus cygnus), flapping wings on water, Finland, January.
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Jussi Murtosaari / Whooper swan (Cygnus cygnus), flapping wings on water, Finland, January.
White-throated dipper (Cinclus cinclus), on a rock in river, Finland, January.
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Jussi Murtosaari / White-throated dipper (Cinclus cinclus), on a rock in river, Finland, January.
White-throated dipper (Cinclus cinclus), on a rock in river, Finland, February.
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Jussi Murtosaari / White-throated dipper (Cinclus cinclus), on a rock in river, Finland, February.
White-throated dipper (Cinclus cinclus), diving into water, Finland, February.
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Jussi Murtosaari / White-throated dipper (Cinclus cinclus), diving into water, Finland, February.