Bison group walking through the snow by Josh Spice. Original public domain image from Flickr https://www.rawpixel.com/image/4038140/photo-image-animal-public-domainFree Image from public domain licenseBald eagle flying over Soda Butte Creek by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038375/photo-image-bird-animalFree Image from public domain licenseVictoria crowned pigeon, bird photography. Free public domain CC0 image. https://www.rawpixel.com/image/6025048/photo-image-public-domain-blue-natureFree Image from public domain licenseGrizzly sow and yearling near Daisy geyser by Jim Peaco. Original public domain image from Flickr https://www.rawpixel.com/image/4039188/photo-image-tree-plantFree Image from public domain licenseThe Gateway, Entrance to the Garden of the Gods, And Pike's Peak Ten Miles Distant. Formation, Red Sandstone.… https://www.rawpixel.com/image/14291656/photo-image-horse-person-animalFree Image from public domain licenseHummingbird Clearwing MothWe spotted this hummingbird clearwing moth taking a break on a common milkweed leaf.Photo by… https://www.rawpixel.com/image/4028462/photo-image-plant-bee-leafFree Image from public domain licenseAgra - The Principal Gateway of the Taj Mahal by Capt E C Impey https://www.rawpixel.com/image/14273229/agra-the-principal-gateway-the-taj-mahal-capt-impeyFree Image from public domain licenseHot sheep in the Powder River badlands near Broadus, Montana by Laton Alton Huffman https://www.rawpixel.com/image/14273293/photo-image-horse-person-animalFree Image from public domain licenseLeft, forearm showing nerves; centre, eardrum; right, forearm showing nerves. Coloured engraving, 1834-1837. https://www.rawpixel.com/image/13965521/image-cartoon-hand-personFree Image from public domain licenseSparrow fledgeling in a sagebrush by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4038330/photo-image-tree-plant-babyFree Image from public domain licenseDe formato foetu. [De brutorum loquela. De venarum ostiolis. De locutione et eius instrumentis liber / a J. Ursino editus]. https://www.rawpixel.com/image/13982631/image-cartoon-person-artFree Image from public domain licenseMitchell's Fall - Black Mountains. [North Carolina] by Rufus Morgan https://www.rawpixel.com/image/14297846/mitchells-fall-black-mountains-north-carolina-rufus-morganFree Image from public domain license"La Fermeté", Sculpture by Pierre-Bernard Prouha, Decoration of the Louvre, Paris by Édouard Baldus https://www.rawpixel.com/image/14323784/image-face-person-artFree Image from public domain licenseButterfly on thistle at Brookhaven National Laboratory. Original public domain image from Flickr https://www.rawpixel.com/image/3322482/free-photo-image-animal-bee-blossomFree Image from public domain licenseMosquito cartoon clipart, illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/7372080/vector-public-domain-illustrations-freeFree Vector from public domain licenseA pack of dogs is falling head over heels in their pursuit of a stag. Etching by J.E. Ridinger. https://www.rawpixel.com/image/13964473/image-dogs-paper-cartoonFree Image from public domain licenseChargé Green's visit to Antarctica, November 2014.Original public domain image from Flickr https://www.rawpixel.com/image/8754103/photo-image-public-domain-bird-penguinFree Image from public domain licenseMonarch caterpillar on common milkweedWe spotted this small monarch caterpillar munching on some common milkweed.Photo by… https://www.rawpixel.com/image/4028281/photo-image-plant-leaf-natureFree Image from public domain licenseA goatherd lies down to rest with his goats and his dog. Etching by F. Müller. https://www.rawpixel.com/image/13976298/goatherd-lies-down-rest-with-his-goats-and-his-dog-etching-mullerFree Image from public domain licenseA stag is chased by three dogs into a torrential river during a hunt. Etching by J.E. Ridinger. https://www.rawpixel.com/image/13986684/image-dogs-paper-cartoonFree Image from public domain licenseA terrier dog has chased a rat into a corner and is about to kill it. Wood engraving by E. Griset. https://www.rawpixel.com/image/13979239/image-dog-cartoon-artFree Image from public domain licenseFirst Connecticut Battery, Near Fredericksburg by A J Russell https://www.rawpixel.com/image/14277617/first-connecticut-battery-near-fredericksburg-russellFree Image from public domain licenseLadybug clipart, animal illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/6864607/vector-sticker-public-domain-illustrationsFree Vector from public domain licenseCanter Visscher Manuscript (c. 1750 - c. 1755) by Adrianus Canter Visscher and anonymous https://www.rawpixel.com/image/13743549/image-paper-cartoon-faceFree Image from public domain licenseCartoon bulldog clipart, cute animal illustration. Free public domain CC0 image. https://www.rawpixel.com/image/6430652/image-public-domain-illustrations-dogFree Image from public domain licenseOld Age, plate four from Depicting the Four Ages of Man by Abraham Bosse https://www.rawpixel.com/image/8996704/old-age-plate-four-from-depicting-the-four-ages-man-abraham-bosseFree Image from public domain licenseMegachile apicalis, female, right side_2012-07-16-17.28Megachile apicalis is an invasive species from Europe. In the U. S.… https://www.rawpixel.com/image/4038286/photo-image-bee-animalFree Image from public domain licenseA table of Christian signs, symbols and images; top centre the Virgin of Loreto. Etching. https://www.rawpixel.com/image/13999706/image-dog-horse-cartoonFree Image from public domain licenseAn Indian deity wrestles with a white horse. Gouache painting by an Indian artist, ca. 1650. https://www.rawpixel.com/image/13963781/image-horse-cartoon-plantFree Image from public domain licenseChicks on Stony Man NestPart of the Peregrine Falcon reintroduction project, 2006 https://www.rawpixel.com/image/9653139/photo-image-plant-animal-public-domainFree Image from public domain licenseSummer Reapers arriving in the Pontine Marshes by Robert, Musée du Louvre by Adolphe Braun https://www.rawpixel.com/image/14310545/image-horse-people-artFree Image from public domain licenseBrown dog collage element, drawing illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/7576613/vector-public-domain-dog-illustrationsFree Vector from public domain licenseFree parents duck and ducklings floating on the water image, public domain animal CC0 photo. https://www.rawpixel.com/image/5917644/photo-image-background-public-domain-natureFree Image from public domain licenseSaint Adalbert of Egmond, from Saints of the North and South Netherlands by Cornelis Visscher https://www.rawpixel.com/image/9033420/image-paper-person-birdFree Image from public domain licenseFree black and white dog with red leash image, public domain animal CC0 photo. https://www.rawpixel.com/image/5912638/image-background-public-domain-dogFree Image from public domain licenseSoldiers in formation riding through Oneonta, N.Y. by E S Thorn https://www.rawpixel.com/image/14299423/soldiers-formation-riding-through-oneonta-ny-thornFree Image from public domain license