Doug Allan / Emperor penguin {Aptenodytes forsteri} males huddle for warmth in minus 40 degrees centigrade while incubating eggs in winter, Antarctica Winter extreme cold survival birds seabirds nesting-behaviour
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Alex Hyde / Lesser burdock (Arctium minus) close up of seed hooks that catch on animal fur, allowing the seedhead to be transported, Peak District National Park, Derbyshire, UK. February.
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Rolf Nussbaumer / Crested Tit {Lophophanes cristatus} adult on frozen branch in winter, minus 15 Celsius, Switzerland
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David Tipling / Emperor penguin chick creche {Aptenodytes forsteri} minus 40 C, Weddell Sea, Antarctica.
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Ashley Cooper / Frozen hand print on an iced over car window, Ambleside, Cumbria UK. December 2008
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Ashley Cooper / 'Brrrrrr' written on a car window in the frost, Ambleside, Cumbria UK. December 2008
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Nick Upton / Common centaury (Centaurium erythraea) flowers, Wiltshire, UK, July.
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Sue Daly / Common centuary (Centaurium erythraea). Sark, British Channel Islands, July.
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Nick Upton / Lesser meadow rue (Thalictrum minus) flowering among Purple scabious (Knautia purpurea) on Piva plateau, near Trsa, Montenegro, July.
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Nick Upton / Common centaury (Centaurium erythraea) flowering in sandy scrubland near the coast, Lasithi, Crete, Greece, May 2013.
Alex Hyde / Lesser Burdock (Arctium minus) seedheads (burrs) showing velcro-like hooks that catch on animal fur, Peak District National Park, Derbyshire, UK. April.