Greyscale photo of a lizard in Shanghai Zoo. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3305442/free-photo-image-black-animal-animals-images-picturesFree Image from public domain licenseFree southern white faced owl close up portrait photo, public domain animal cc0 image. https://www.rawpixel.com/image/5920453/photo-image-public-domain-nature-featherFree Image from public domain licenseZoological Society of London: a roebuck. Coloured etching by W. Panormo. https://www.rawpixel.com/image/13964153/zoological-society-london-roebuck-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 licenseA male lion baring its teeth next to a rough rock on a savannah. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3282792/free-photo-image-animals-desert-public-domain-animalFree Image from public domain licenseZoological Society of London: a lynx. Coloured etching by W. Panormo. https://www.rawpixel.com/image/13958502/zoological-society-london-lynx-coloured-etching-panormoFree Image from public domain licenseFree meerkat sitting on dirt floor image, public domain animal CC0 photo. https://www.rawpixel.com/image/5922822/photo-image-background-public-domain-natureFree Image from public domain license Rattlesnake Jake's Gift Shop in Keystone, a tiny South Dakota tourist town near the Mount Rushmore… https://www.rawpixel.com/image/8067236/photo-image-face-plant-personFree Image from public domain licenseU.S. Department of Agriculture USDA Animal Care Inspector observing medical treatment in a clinical setting at the San… https://www.rawpixel.com/image/9647120/photo-image-person-tiger-animalFree Image from public domain licenseFree squirrel monkey in rainforest image, public domain animal CC0 photo. https://www.rawpixel.com/image/5920151/photo-image-public-domain-tree-natureFree Image from public domain licenseChipmunks Find Food in Camping Area of Dead Horse Point State Park, 05/1972. Original public domain image from Flickr https://www.rawpixel.com/image/8799552/photo-image-public-domain-cat-foodFree Image from public domain licenseUeno dierentuin (1945) by Onchi Kōshirō, Hirai Koichi and Uemura Masuro https://www.rawpixel.com/image/13733027/ueno-dierentuin-1945-onchi-koshiro-hirai-koichi-and-uemura-masuroFree Image from public domain licenseAnimal Care Inspector observes San Antonio Zoo staff handle a guinea pig at the San Antonio Zoo in San Antonio, TX, on July… https://www.rawpixel.com/image/9647006/photo-image-animal-public-domain-loveFree Image from public domain licenseThe Pasteur Institute, Kasauli, India: a caged monkey with drooping eyes (ptosis) due to rabies. Photograph, ca. 1910. https://www.rawpixel.com/image/13968981/photo-image-eyes-animal-public-domainFree Image from public domain licenseAnimal travel enclosure at the San Antonio Zoo in San Antonio, TX, on July 26, 2022.For more information about the USDA… https://www.rawpixel.com/image/9647119/photo-image-animal-public-domain-loveFree Image from public domain licenseCheetah at Myrtle Beach Zoo. Original image from Carol M. Highsmith’s America, Library of Congress collection.… https://www.rawpixel.com/image/422099/free-photo-image-cat-cheetah-animalsFree Image from public domain licenseGiraffe in monotone. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3286502/free-photo-image-black-and-white-natureFree Image from public domain licenseSketch of a cat (1813) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481389/free-illustration-image-cat-sketch-vintageFree Image from public domain licenseTiger by Kōno Bairei (1844-1895). Digitally enhanced from our own original 1913 edition of Bairei Gakan. https://www.rawpixel.com/image/459359/free-illustration-image-tiger-japan-japaneseFree Image from public domain licenseHead of a calico cat with open eyes (1819) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by… https://www.rawpixel.com/image/481409/free-illustration-image-cat-animals-vintageFree Image from public domain licenseHead of a cow by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481478/free-illustration-image-cow-animalsFree Image from public domain licenseAn up-close look at a giraffe at the Gladys Porter Zoo in Brownsville, Texas. Original image from Carol M. Highsmith’s… https://www.rawpixel.com/image/422033/free-photo-image-animal-giraffe-cloudFree Image from public domain licenseIndian rhinoceros (Rhinoceros unicornis) illustrated by Charles Dessalines D' Orbigny (1806-1876). Digitally enhanced from… https://www.rawpixel.com/image/324434/free-illustration-image-rhinoceros-animals-orbignyFree Image from public domain licenseA brown and white horse on a road next to a fence by Jean Bernard (1802). Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481627/free-illustration-image-horse-jean-bernard-artFree Image from public domain licenseSketch of a cat (1813) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481459/free-illustration-image-cat-face-vintageFree Image from public domain licenseBlue Poison Frog (2010) by Smithsonian Institution. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3061719/free-photo-image-forest-frog-poisonous-dartFree Image from public domain licenseMouse by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481324/free-illustration-image-mouse-rat-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/481394/free-illustration-image-donkey-face-engravingFree Image from public domain licenseWhite Bengal tiger at the Montgomery Zoo, it was established in 1920 as part of Oak Park. Original image from Carol M.… https://www.rawpixel.com/image/421758/free-photo-image-tiger-animal-wild-animalsFree Image from public domain licenseGuanaco (ca. 1848) painting in high resolution by Jacques–Laurent Agasse. Original from The Yale University Art… https://www.rawpixel.com/image/3003613/free-illustration-image-vintage-victorian-printable-guanacoFree Image from public domain licenseCartoon lion png sticker, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6763363/png-sticker-public-domainFree PNG from public domain licenseThree horse heads (1812) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481480/free-illustration-image-horse-vintage-sketchFree Image from public domain licenseLion by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481541/free-illustration-image-lion-africa-tattooFree Image from public domain licenseBison drawing png, wild animal sticker vintage illustration, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6271426/png-sticker-vintageFree PNG from public domain licenseCartoon elephant png sticker animal illustration, transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6870574/png-sticker-public-domainFree PNG from public domain licenseTwo bull heads (1809 - 1833) by Jean Bernard (1775-1883). Original from The Rijksmuseum. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/481441/free-illustration-image-cow-bulls-jean-bernardFree Image from public domain licenseGiant Panda (2007) by Mehgan Murphy. Original from Smithsonian's National Zoo. Digitally enhanced by rawpixel. https://www.rawpixel.com/image/3060893/free-photo-image-panda-giant-natureFree Image from public domain license