Zoological Society of London: a Rusa deer. Coloured etching by W. Panormo. https://www.rawpixel.com/image/13968112/zoological-society-london-rusa-deer-coloured-etching-panormoFree Image from public domain licenseVisit the zoo (1936) vintage poster by Federal Art Project, W.P.A., Original public domain image from the Library of… https://www.rawpixel.com/image/8628555/image-art-public-domain-blueFree Image from public domain licenseVisit the zoo (1936) vintage poster by Federal Art Project, W.P.A., Original public domain image from the Library of… https://www.rawpixel.com/image/8631663/image-art-public-domain-blueFree Image from public domain licenseZoological Society of London: two Ganges stags. Coloured etching by W. Panormo. https://www.rawpixel.com/image/13953237/zoological-society-london-two-ganges-stags-coloured-etching-panormoFree Image from public domain licenseZoological 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 licenseZoological Society of London: a Brahmin bull. Coloured etching by J. Russell after H.S. Smith. https://www.rawpixel.com/image/13952589/image-cartoon-cow-animalFree Image from public domain licenseHead of a donkey (1818) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481468/free-illustration-image-donkey-vintage-antique-1800sFree Image from public domain license