Panel 6: Herring Gull, Ring-billed Gull, Sabine's Gull, Bonaparte's Gull, Laughing Gull by Louis… https://www.rawpixel.com/image/8905433/image-watercolor-art-vintageFree Image from public domain licenseBonapartian Gull from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University… https://www.rawpixel.com/image/277501/free-illustration-image-audubon-gull-birds-america-public-domainFree Image from public domain license287, 288. Bonaparte's Gull (Larus bonaparti) illustration from Zoology of New York (1842–1844) by James Ellsworth De… https://www.rawpixel.com/image/329438/free-illustration-image-century-birds-new-york-zoologyFree Image from public domain license