White-backed woodpecker 1♀ , 2♂ (Dryobates leucotus) illustrated by the von Wright brothers. Digitally enhanced from our own…
https://www.rawpixel.com/image/325980/free-illustration-image-von-wright-brothers-bird-white-backed-woodpecker-vintageFree Image from public domain license
Pied Wagtai Male ♂ (MOTACILLA ALBA) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio…
Brambling (Fringilla Montifringilla) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio…
https://www.rawpixel.com/image/325647/free-illustration-image-von-wright-brothers-birds-the-von-brothers-fringillaFree Image from public domain license
Aegithalus caudatus (Long-tailed tit) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio…