https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13987658Edit ImageSaveSaveEditCropCustom TextTwo higher primate skulls compared. Lithograph by G H Ford.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 891 x 1200 px | 300 dpiLarge JPEG 2291 x 3086 px | 300 dpiFree DownloadTwo higher primate skulls compared. Lithograph by G H Ford.More