Lesser Tern from Birds of America (1827) by John James Audubon, etched by William Home Lizars. Original from University of… https://www.rawpixel.com/image/277562/free-illustration-image-audubon-birds-america-public-domain-birdFree Image from public domain licenseBlack Toed Gull, Richardson's Skua, Glaucous Gull, Black Tern, and Lesser Tern. Digitally enhanced from our own original… https://www.rawpixel.com/image/411919/free-illustration-image-vintage-animals-common-tern-seagullFree Image from public domain licenseTorres' Tern (Thalasseus Torresii) illustrated by Elizabeth Gould (1804–1841) for John Gould’s (1804-1881) Birds… https://www.rawpixel.com/image/321386/free-illustration-image-australia-gould-illustrations-birdFree Image from public domain licenseSeven birds: water rail, toucan, skimmer, avocet, woodcock, redshank and lesser tern. Etching by J. Scott, ca. 1808. https://www.rawpixel.com/image/14005838/image-paper-cartoon-artFree Image from public domain license