Sven Zacek,Sven Zacek / European Greenfinch (Carduelis chloris) in flight. Southern Estonia, December.

Sven Zacek,Sven Zacek / European Greenfinch (Carduelis chloris) in flight. Southern Estonia, December.

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

Jed Weingarten / Wild Wonders of China / Mixed flock of Mountain finches including Brandt's mountain finches (Leucosticte brandti) China, Sichuan Province, Garze Prefecture, Serxu County.

Jed Weingarten / Wild Wonders of China / Mixed flock of Mountain finches including Brandt's mountain finches (Leucosticte brandti) China, Sichuan Province, Garze Prefecture, Serxu County.

Matthew Maran / Linnets (Carduelis cannabina) and Gold finches (Carduelis carduelis) feeding in field of sunflower seedheads, Devon, England, UK, November.

Julian Hume / Flock of Ancestral cardueline finches arriving on Hawaiian Island around 4 million years ago. Eurasian rosefinches (Carpodacus sp) are the most likely ancestors of the Hawaiian honeycreepers.

Erlend Haarberg / Greenfinch (Carduelis chloris) and Chaffinch (Fringilla coelebs) fighting mid-air, Vauldalen, Norway. May

Mark Hamblin / Siskin (Carduelis spinus) male in flight preparing to land, Scotland, UK, May.

Bence Mate / Flock of Tree sparrows (Passer montanus) in flight, blurred motion, Pacsmag, Hungary

Jussi Murtosaari / Hawfinch (Coccothraustes coccothraustes), male perched on twig, Uto, Finland, May.

Dong Lei / Plain mountain-finches (Leucosticte nemoricola) feeding. Kawakarpo Mountain, Meri Snow Mountain National Park, Yunnan Province, China, October.