Glaucidium passerinum illustrated by the von Wright brothers. Digitally enhanced from our own 1929 folio version of Svenska… https://www.rawpixel.com/image/325613/free-illustration-image-owl-von-wright-brothersFree Image from public domain licenseTengmalm's Owl from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University… https://www.rawpixel.com/image/277452/free-illustration-image-owl-audubon-america-birds-public-domain-audubonFree Image from public domain licenseRufous Owl (Athene rufa) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881) Birds of… https://www.rawpixel.com/image/321084/free-illustration-image-owl-vintage-australiaFree Image from public domain licenseBoobook Owl (Athene boobook) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881) Birds of… https://www.rawpixel.com/image/321039/free-illustration-image-owl-australia-gouldFree Image from public domain license28. The American Barn Owl (Strix pratincola) 29. The Great Gray Owl (Syrnium cinereum) illustration from Zoology of New York… https://www.rawpixel.com/image/329364/free-illustration-image-owl-barn-vintageFree Image from public domain licenseLinear illustration of a bird animal https://www.rawpixel.com/image/518121/premium-illustration-vector-geometric-owl-linear-animals-patternView license25. & 26. The Little Screech Owl (Bubo asio) 27. The Short-eared Owl (Otus palustris) illustration from Zoology of New York… https://www.rawpixel.com/image/329351/free-illustration-image-owl-vintage-james-ellsworthFree Image from public domain license19. The Hawk Owl (Surnia funerea) 20. The Snow Owl (Surnia nyctea) illustration from Zoology of New York (1842–1844)… https://www.rawpixel.com/image/329331/free-illustration-image-owl-snow-birdFree Image from public domain licenseWinking Owl (Athene connivers) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881) Birds of… https://www.rawpixel.com/image/321061/free-illustration-image-owl-australia-john-gouldFree Image from public domain licenseDead owl by Jean Bernard (1775-1883). Original from The Rijksmuseum. 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