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.
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.
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.
Whooper swans (Cygnus cygnus) flock in spring, Lake Tysslingen, central Sweden March
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Pal Hermansen / Whooper swans (Cygnus cygnus) flock in spring, Lake Tysslingen, central Sweden March
European robin (Erithacus rubecula) Hampstead Heath, London, England, UK. January.
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Matthew Maran / European robin (Erithacus rubecula) Hampstead Heath, London, England, UK. January.
Atlantic Puffin (Fratercula arctica) flock resting on a snow bank, Hornya, Varanger, Norway, April
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Danny Green / Atlantic Puffin (Fratercula arctica) flock resting on a snow bank, Hornya, Varanger, Norway, April
RF - Grey Andalusian mare running in snow, Berthoud, Colorado, USA. January. (This image may be licensed either as rights managed or royalty free.)
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Carol Walker / RF - Grey Andalusian mare running in snow, Berthoud, Colorado, USA. January. (This image may be licensed either as rights managed or royalty free.)
Avenue of trees in snow with benches, Kenwood Estate, Hampstead Heath, London, England, January 2013.
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Matthew Maran / Avenue of trees in snow with benches, Kenwood Estate, Hampstead Heath, London, England, January 2013.
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
Portuguese oak  tree leaf (Quercus faginea) and Blackberry leaf (Rubus fruticosa) leaf in ice, Sierra de Grazalema Natural Park, southern Spain, February.
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Andres M. Dominguez / Portuguese oak tree leaf (Quercus faginea) and Blackberry leaf (Rubus fruticosa) leaf in ice, Sierra de Grazalema Natural Park, southern Spain, February.
Male Black grouse (Tetrao / Lyrurus tetrix) in snow, Utajarvi, Finland, May.
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Markus Varesvuo / Male Black grouse (Tetrao / Lyrurus tetrix) in snow, Utajarvi, Finland, May.
Nenet herders travel by Reindeer (Rangifer tarandus) sled on spring migration across tundra. Yar-Sale district, Yamal, Northwest Siberia, Russia. April 2016.
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Eric Baccega / Nenet herders travel by Reindeer (Rangifer tarandus) sled on spring migration across tundra. Yar-Sale district, Yamal, Northwest Siberia, Russia. April 2016.