Jussi Murtosaari / European Dipper (Cinclus cinclus) on ice next to stream, winter, Finland. February.

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.

Tony Heald / Junglefowl (Gallus gallus) male, Kaziranga National Park, Assam, India, March.

George Sanker / Mourning Dove (Zenaida macroura) perched on branch in snow, Acadia National Park, Maine, USA, February.

Markus Varesvuo / Pine Grosbeak (Pinicola enucleator) male feeding on berries with traffic light behind, Oulu, Finland, December

Mark Hamblin / 2020VISION / Male Blackbird (Turdus merula) perched on garden seat in winter, with feathers ruffled to insulate against cold, Scotland, UK, December 2010

Wild Wonders of Europe / Giesbers / Alpine chough (Pyrrhocorax graculus) perching on wood with feathers ruffled, Liechtenstein, June 2009

Jose B. Ruiz / Common / House sparrow {Passer domesticus} male perching on stone with feathers ruffled, Quintana de la Serena, Badajoz, Extremadura, Spain April

Marie Read / Short-eared Owl (Asio flammeus) shaking after preening while perched on fencepost, Boxelder County, Utah, USA, May.

Stephane Granzotto / Pygmy owl (Glaucidium passerinum) perched in a tree and looking around, with puffed out feathers, Rhone-Alpes, France, September.

Staffan Widstrand / Wild Wonders of China / Golden pheasant (Chrysolophus pictus) female walking over a branch, Yangxian Biosphere Reserve, Shaanxi, China

Frederique Olivier / Black browed albatross (Thalassarche melanophris) settling to rest, feathers ruffled by the wind, West Point Island, Falkland Islands.