Used attributively to describe something relating to or characteristic of a chaffinch.
Definitions
chaffinchnoun
A small passerine bird of the finch family, Fringillidae, native to Europe, western Asia, and northwestern Africa, known for its colorful plumage and melodious song.
The chaffinch is often seen flitting about in gardens and woodlands, its bright colors making it easy to spot.
chaffinchadjective
Relating to, characteristic of, or produced by a chaffinch.
The guide identified the soft, chaffinch song coming from the hedgerow.