The Common Chaffinch (Fringilla coelebs) is a medium-sized, well-proportioned finch, 14–16 cm long with a wingspan of 24–28 cm and a weight of 18–28 g, best known for its bold white wing bars that flash clearly in flight. The breeding male is one of the more colourful birds of the season: a blue-grey crown and nape, a reddish-brown-to-orange back, wine-red breast and belly, a green rump, and black wings crossed by two prominent white bars — colours at their brightest in April–May after the spring moult. The female is greyish olive-brown above and buff below, lacking the male's red tones but sharing his white wing bars and green rump, both diagnostic in flight; juveniles resemble the female but show heavier streaking. In winter males look somewhat duller but remain recognisable, often mixing into flocks with Bramblings.
The song is an accelerating, descending phrase of two to three seconds ending in a characteristic flourish, roughly "tjipp-tjipp-tjipp-tjuijuu-tjuijuu-vitt-tjuitt", with young males learning regional dialects from their neighbours, so the song varies noticeably between areas. The call is the familiar "pink-pink" heard year-round, one of the most common bird sounds in the region, with a rough "huit" alarm at aerial predators and a sharper "tink" for ground threats. Common Chaffinches breed across the whole region up to the tree line, one of the most numerous breeding birds, favouring deciduous and mixed woodland but also present in conifer forest, parks, gardens and avenues; the nest is an exceptionally neatly built, moss-and-lichen-camouflaged cup placed 1–10 m up in a tree fork, and the female lays 4–5 blue-green, red-brown-spotted eggs incubated for 11–13 days, with young fledging after 11–18 days. The species is a partial migrant — mainly males and southern birds remain through winter, feeding on spilled grain and fallen seed, while females and juveniles move further south, a pattern that gave the species its Latin epithet coelebs, "bachelor". In autumn the diet turns strongly to beech mast, often gathered on the ground in large flocks alongside Bramblings, and the species is classified as Least Concern (LC).
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