Bernard Castelein / Greenfinch (Carduelis chloris), Brasschaat, Belgium. November

Konrad Wothe / Male Greenfinch (Chloris chloris) singing, Bavaria, Germany, April.

Konrad Wothe / Male Greenfinch (Chloris chloris) preening and singing, Bavaria, Germany, April.

Loic Poidevin / Greenfinch (Carduelis chloris) on lichen covered branch, Vendee, Pays-de-la-Loire, France. March.

Andres M. Dominguez / European greenfinch (Carduelis chloris), Andalusia, Spain, June.

Bernard Castelein / Greenfinch (Carduelis chloris) Brasschaat, Belgium

Bernard Castelein / Greenfinch (Carduelis chloris) collecting nesting material, Brasschaat, Belgium

Bernard Castelein / Greenfinch (Carduelis chloris) bathing, Brasschaat, Belgium

Bernard Castelein / Greenfinch (Carduelis chloris) bathing, Brasschaat, Belgium

Bernard Castelein / Greenfinch (Carduelis chloris) drinking, Brasschaat, Belgium

Bernard Castelein / Greenfinch (Carduelis chloris) perched, Brasschaat, Belgium July.

Phil Savoie / European Greenfinch (Chloris chloris) flying at dawn. When backlit the tiny transparent barbs that make up the feather act like a prism revealing vivid colours in the early light. Monmouthshire, Wales...