Zoological Society of London: a condor attacking a lamb on a rock. Coloured etching by W. Panormo after H. Smith. https://www.rawpixel.com/image/13967858/image-dog-cartoon-personFree Image from public domain licenseTwee beflijsters (Purdus torquatus) met een ei (1749 - 1811) by Jan Christiaan Sepp https://www.rawpixel.com/image/13736688/image-paper-art-watercolorFree Image from public domain licenseHead of a Raven in Profile, from The Raven (Le Corbeau) by Édouard Manet https://www.rawpixel.com/image/8977123/head-raven-profile-from-the-raven-le-corbeau-edouard-manetFree Image from public domain licenseCrow on Tree. Original public domain image from the MET museum. https://www.rawpixel.com/image/7640141/original-public-domain-image-from-the-met-museumFree Image from public domain licenseA Cock by Johan Teyler (1648-1709). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/514928/free-illustration-image-chicken-rooster-cockFree Image from public domain licenseGraucalus pollens Coracina personata pollens (Subspecies of Wallacean Cuckooshrike) https://www.rawpixel.com/image/11761620/image-white-background-plant-artFree Image from public domain licenseVogel op een tak van een kersenboom (1800 - 1900) by Ishikawa Kazan https://www.rawpixel.com/image/13741300/vogel-een-tak-van-een-kersenboom-1800-1900-ishikawa-kazanFree Image from public domain licenseA Cock by Johan Teyler (1648-1709). Original from Rijks Museum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/515042/premium-illustration-psd-rooster-chicken-leg-animalView licenseA grossbill (grosbeak) sitting on a branch of a tree. Etching by Heath. https://www.rawpixel.com/image/13983637/grossbill-grosbeak-sitting-branch-tree-etching-heathFree Image from public domain licenseRuit met een vogel op een tak (c. 1650 - c. 1675) by anonymous https://www.rawpixel.com/image/13750344/ruit-met-een-vogel-een-tak-c-1650-1675-anonymousFree Image from public domain licenseA crow is standing on the handle of a large pitcher in front of a well; illustration of a fable by J. Ogilby. https://www.rawpixel.com/image/13975826/image-cloud-horse-cartoonFree Image from public domain license