The world's oldest trees, Bristlecone Pines, in the Inyo National Forest, California. The trees range from 4,000 to 5,000… https://www.rawpixel.com/image/3390963/free-photo-image-animal-bristlecone-trees-cc0Free Image from public domain licensePig png sticker, farm animal illustration on transparent background. Free public domain CC0 image. https://www.rawpixel.com/image/6489844/png-sticker-public-domainFree PNG from public domain licenseGrizzly bear silhouette clipart, wildlife illustration in black. 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Scheffer, 1881. https://www.rawpixel.com/image/14014738/image-dog-cartoon-faceFree Image from public domain licensePortrait of Thomas Cholmondeley, first Lord Delamere, on His Hunter (study for "The Cheshire Hunt at Tatton Park") https://www.rawpixel.com/image/9205807/image-vintage-paintings-public-domainFree Image from public domain licenseNaamkaartje Back Beer met een beer in een trog of bak (1812 - 1851) by Benjamin Phelps Gibbon and Bartholomeus Breenbergh https://www.rawpixel.com/image/13755236/image-paper-cartoon-personFree Image from public domain licenseTwee tulpen met waterjuffer en dagpauwoog (1637) by Jacob Marrel https://www.rawpixel.com/image/13741366/twee-tulpen-met-waterjuffer-dagpauwoog-1637-jacob-marrelFree Image from public domain licenseFree African elephant family image, public domain wild animal CC0 photo. https://www.rawpixel.com/image/5906537/photo-image-public-domain-nature-familyFree Image from public domain licenseSilhouette flying bats clipart, animal illustration. 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Original from The Rijksmuseum.… https://www.rawpixel.com/image/3114157/free-illustration-image-mouse-rodent-jorisFree Image from public domain licenseRuitergevecht (1676 - 1742) by Georg Philipp Rugendas I, Georg Philipp Rugendas I and Georg Philipp Rugendas I https://www.rawpixel.com/image/13779636/image-paper-horse-faceFree Image from public domain licenseMonarch wings in detail as it rests on Maximillian's sunflower. Original public domain image from Flickr https://www.rawpixel.com/image/4025499/photo-image-flower-sunflower-floralFree Image from public domain licenseFabel van het varken en het strijdros (1608) by Aegidius Sadeler II, Marcus Gheeraerts I, Marcus Gheeraerts I and Aegidius… https://www.rawpixel.com/image/13782173/image-paper-horse-cartoonFree Image from public domain licenseHogs relaxing in mud, farm animals. 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Reproduction of a coloured lithograph by Y.G. https://www.rawpixel.com/image/13957686/image-dog-cat-cartoonFree Image from public domain licenseJongen met hondje (1741 - 1820) by Abraham Delfos and Caspar Netscher https://www.rawpixel.com/image/13787506/jongen-met-hondje-1741-1820-abraham-delfos-and-caspar-netscherFree Image from public domain licenseTwee tulpen met waterjuffer en sprinkhaan (1637) by Jacob Marrel https://www.rawpixel.com/image/13741643/twee-tulpen-met-waterjuffer-sprinkhaan-1637-jacob-marrelFree Image from public domain license