Hybrid between common house-martin and barn swallow (Chelidon rustica L.xHirundo urbica) illustrated by the von Wright… https://www.rawpixel.com/image/326005/free-illustration-image-von-wright-brothers-swallow-scandinavianFree Image from public domain licenseMasked Barn Owl (Strix Personata, Vig) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881)… https://www.rawpixel.com/image/321037/free-illustration-image-owl-barn-john-gouldFree Image from public domain licenseBarn Swallow from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University of… https://www.rawpixel.com/image/277318/free-illustration-image-swallow-audubon-birds-america-public-domainFree Image from public domain licenseBarn Owl from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University of… https://www.rawpixel.com/image/277431/free-illustration-image-owl-audubon-audubon-birds-americaFree Image from public domain license