Common raven (Corvus corax) illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of… https://www.rawpixel.com/image/326041/free-illustration-image-raven-corvus-von-wright-brothersFree Image from public domain licenseRaven from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University of… https://www.rawpixel.com/image/277236/free-illustration-image-raven-audubon-birdsFree Image from public domain license