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

Chris Gomersall / 2020VISION / Adult male Northern wheatear (Oenanthe oenanthe) with ruffled plumage feeding on flies from a manure pile, backlit, Hertfordshire, England, UK, April

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

George Sanker / Tricoloured heron (Egretta tricolor) fishing with wings formed into partial umbrella to shade water, making it easier to see prey. At dusk, Myakka River State Park, Florida, USA, March.

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

Sven Zacek / Horned grebe (Podiceps auritus) shaking itself dry after diving. Harjumaa, Northern Estonia. July.