Syncerus caffer, (African buffalo). Skull and neck vertebrae. Galleries of Paleontology and Compared Anatomy. Original… https://www.rawpixel.com/image/3340519/free-photo-image-cc0-creative-commonsFree Image from public domain licenseBlack Cloud, a horse in stable (1882) Scott Leighton. Original from the Library of Congress. https://www.rawpixel.com/image/7688028/image-art-public-domain-animalsFree Image from public domain licenseToday's Holocene Mass Extinction - Undermining the Human Immune System https://www.rawpixel.com/image/6076209/photo-image-public-domain-butterfly-animalFree Image from public domain licenseAberdeen, United Kingdom. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3302973/free-photo-image-animal-cc0-creative-commonsFree Image from public domain licenseThis image was uploaded as part of Wiki Loves e-textbooks contest in Poland. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3338737/free-photo-image-andrena-anemone-animalFree Image from public domain license