https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13984768Edit ImageSaveSaveEditCropCustom TextTwo animal skulls, shown from the side. Lithograph by R. Ball 1857.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 752 x 1200 px | 300 dpiLarge JPEG 1264 x 2016 px | 300 dpiFree DownloadTwo animal skulls, shown from the side. Lithograph by R. Ball 1857.More