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
Dryobates medius illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of Svenska…
Eurasian stone curlew (burhinus oedicnemus) illustrated by the von Wright brothers. Digitally enhanced from our own 1929…
https://www.rawpixel.com/image/325827/free-illustration-image-von-wright-brothers-burhinus-oedicnemus-stone-curlewFree Image from public domain license
Gadwall (Anas (Chauelasmus) Strepera) 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
Mergus serrator illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of Svenska…