Lark sparrowWhite, brown, and black bird perched in a tree Credit NPS/Andy Bridges. Original public domain image from Flickr https://www.rawpixel.com/image/4033548/photo-image-bird-animalFree Image from public domain licenseHerd of elephants at ADDO National Park. Original public domain image from Flickr https://www.rawpixel.com/image/4057179/image-public-domain-elephant-animalFree Image from public domain licenseHorse Shoe Fall from Canada [Niagara Falls, N.Y.] by George E Curtis https://www.rawpixel.com/image/14290812/horse-shoe-fall-from-canada-niagara-falls-ny-george-curtisFree Image from public domain licenseÉtudes sur la maladie des vers à soie : moyen pratique assuré de la combattre et d'en prévenir le retour / par L. Pasteur. https://www.rawpixel.com/image/13987731/image-plant-tree-artFree Image from public domain licenseOesophagus, stomach and intestine from a case of poisoning by hydrochloric acid https://www.rawpixel.com/image/13964883/oesophagus-stomach-and-intestine-from-case-poisoning-hydrochloric-acidFree Image from public domain licenseGrasshopper on Common MilkweedThis grasshopper stopped to take a break on a sturdy common milkweed leaf.Photo by Courtney… https://www.rawpixel.com/image/4028453/photo-image-plant-summer-natureFree Image from public domain licenseElk grazing at Neal Smith National Wildlife RefugePhoto by Danielle Brigida/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028719/photo-image-nature-foodFree Image from public domain license[Five cows, looking out at the viewer, standing in a field with a house behind them] https://www.rawpixel.com/image/7689066/image-art-vintage-public-domainFree Image from public domain licenseCavalry Camp, Balaklava, looking towards the Plateau of Sebastopol. by Roger Fenton https://www.rawpixel.com/image/14284881/photo-image-horse-cow-personFree Image from public domain licenseDode haas, hangend aan een poot (1819 - 1881) by Johannes Tavenraat https://www.rawpixel.com/image/13795750/dode-haas-hangend-aan-een-poot-1819-1881-johannes-tavenraatFree Image from public domain licenseRed-winged blackbirdPhoto by Courtney Celley/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028586/photo-image-plant-bird-summerFree Image from public domain licenseA pair of goldfinches in a treePhoto by Courtney Celley/USFWS. Original public domain image from Flickr https://www.rawpixel.com/image/4028963/photo-image-tree-plant-leafFree Image from public domain licenseNorthern Water SnakeNorthern water snake at the Horseshoe Bend unit of Port Louisa National Wildlife Refuge in Iowa.Photo by… https://www.rawpixel.com/image/4029060/photo-image-nature-water-snakeFree Image from public domain licenseRed bird perching on branch. Original public domain image from Flickr https://www.rawpixel.com/image/4030071/cardinal-john-heinz-national-wildlife-refugeFree Image from public domain licenseTwo plants, one possibly of the Labiatae family: flowering stems with pink and yellow flowers. Watercolour. https://www.rawpixel.com/image/13967139/image-flower-plant-artFree Image from public domain licenseEvidence as to man's place in nature / by Thomas Henry Huxley. https://www.rawpixel.com/image/14000427/evidence-mans-place-nature-thomas-henry-huxleyFree Image from public domain licenseA Blackfoot Indian medicine man. Coloured photograph, ca. 1913. https://www.rawpixel.com/image/13967799/blackfoot-indian-medicine-man-coloured-photograph-ca-1913Free Image from public domain licenseBreve e sustantiale trattato intorno alle figure anathomiche delli più principali animali terestri, aquatili, et volatili /… https://www.rawpixel.com/image/14008018/image-paper-cartoon-personFree Image from public domain licenseSnake, grey-green in colour. Watercolour by Bhawani Das, 1782. https://www.rawpixel.com/image/13961605/snake-grey-green-colour-watercolour-bhawani-das-1782Free Image from public domain licenseThesaurus anatomicus primus [-decimus] ... Het eerste [-tiende] anatomisch cabinet / [Frederik Ruysch]. https://www.rawpixel.com/image/14004704/image-cartoon-plant-artFree Image from public domain licenseView of the Capital standing in Market St., Montgomery, Alabama by C L Payne https://www.rawpixel.com/image/14298124/view-the-capital-standing-market-st-montgomery-alabama-payneFree Image from public domain licenseA hare standing on a rugged rock outside a forest getting wind of its environment. Etching by J.E. Ridinger. https://www.rawpixel.com/image/13974475/image-plant-tree-artFree Image from public domain licenseBones and cross-sections of bones of an okapi, a giraffe and a samotherium. Lithograph by P. J. Smit. https://www.rawpixel.com/image/13980255/image-paper-person-crossFree Image from public domain licenseVictoria Crowned Pigeon, bird photography. Free public domain CC0 image. https://www.rawpixel.com/image/6032169/photo-image-public-domain-nature-birdFree Image from public domain licenseFall at Inversnaid, Loch Lomond. by George Washington Wilson https://www.rawpixel.com/image/14300575/fall-inversnaid-loch-lomond-george-washington-wilsonFree Image from public domain licenseCute reindeer collage element illustration vector. Free public domain CC0 image. https://www.rawpixel.com/image/7558884/vector-cloud-christmas-public-domainFree Vector from public domain licenseCymindis unicolor (top view)NPS PhotoUSA: Wyoming, Park CountyYellowstone NP, Washburn TopPitfall Trap, Elev: 2932 m22… https://www.rawpixel.com/image/4038132/photo-image-animal-public-domainFree Image from public domain license