The Principal breeds of horses in use in North America (ca. 1872). Original from the Library of Congress. https://www.rawpixel.com/image/7688035/image-art-public-domain-animalsFree Image from public domain licenseScenes from a Legend, probably (ca. 1515–1520) by Giovanni Larciani (Master of the Kress Landscapes). https://www.rawpixel.com/image/8232012/image-art-vintage-public-domainFree Image from public domain licenseBlack swallowtail butterfly caterpillar on fennel (Foeniculum vulgare) host plant. https://www.rawpixel.com/image/6080324/photo-image-public-domain-plant-greenFree Image from public domain licenseA pile of silicon carbide, grade 60 mesh (grain size about 0.25 mm (0.0098 in)). The picture is focus stacked from eight… https://www.rawpixel.com/image/3340927/free-photo-image-animal-cc0-creative-commonsFree Image from public domain licenseOtters 1Otters rock. These otters rocked hard. They were loving the rain and dancing all over the place. Original public… https://www.rawpixel.com/image/5975716/photo-image-public-domain-animalFree Image from public domain licenseThe Flight into Egypt (ca. 1550–1575) by Anonymous Artist & Joachim Patinir. https://www.rawpixel.com/image/8229641/image-art-vintage-public-domainFree Image from public domain license