https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13970354Edit ImageSaveSaveEditCropCustom TextTwo house martins or swallows. Engraving by F. Place, ca. 1690, after F. Barlow.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 912 px | 300 dpiLarge JPEG 3047 x 2315 px | 300 dpiFree DownloadTwo house martins or swallows. Engraving by F. Place, ca. 1690, after F. Barlow.More