finch n.

common oscine passerine bird of Europe, 1560s, from bull (n.1) + finch; supposedly so called for the shape of its head and neck or its bill; compare French bouvreuil.

Fringilla cælebs, common European bird "with pretty plumage and pleasant short song" [OED], Old English ceaffinc, literally "chaff-finch," said to be so called because it eats waste grain among the chaff on farms in winter. See chaff + finch.