Marie Read / Common redpoll (Carduelis flammea), male perched in alder (Alnus rugosa) during a snowstorm in winter, New York, USA, January.

Ernie Janes / Goldfinch (Carduelis carduelis) feeding on thistle flowers, England

Nick Saunders/ BIA / Pine Siskin (Carduelis pinus), Saskatchewan, Canada

Ben Hall / Greenfinch (Carduelis chloris) pair, one perched on branch and one hovering in snowfall, Derbyshire, February.

Andy Trowbridge / Male Goldfinch (Carduelis carduelis) perched on flowering European bird cherry (Prunus padus). Southern Norway. May.

Alan Murphy / Common Redpoll (Carduelis flammea) during snowfall, Alaska

Alan Murphy / Common Redpoll (Carduelis flammea), Alaska

Scott Leslie / American Goldfinch (Carduelis tristis) in winter with berries, Maine

Marie Read / American goldfinch (Carduelis tristis) male in breeding plumage, perched in Eastern redbud flowers in spring, New York, USA May.

Ben Cranke / Arctic Redpoll (Carduelis hornemanni) perched on frosty plant, Finland. February.

Markus Varesvuo / Greenfinch (Carduelis carduelis) perched on branch, feeding on snow covered berries, Vantaa Finland, Scandinavia, December.

Markus Varesvuo / Two Common redpolls (Careduelis flammea) feeding, Liminka, Finland, February