https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13965309Edit ImageSaveSaveEditCropCustom TextAbove, an anabas seen from the side; middle, cross-sections of the heads and gills of two fishes; below, a ophicephalus seen from the side. Stipple engraving by Teillard after P.L. Oudart.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 820 px | 300 dpiLarge JPEG 3200 x 2186 px | 300 dpiFree DownloadAbove, an anabas seen from the side; middle, cross-sections of the heads and gills of two fishes; below, a ophicephalus seen from the side. Stipple engraving by Teillard after P.L. Oudart.More