Amputated right tibia of a giant sea turtle archelon Ischyros; from Pierre Cretaceous of the South Fork, Cheyenne, South Dakota

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: Amputated right tibia of a giant sea turtle archelon Ischyros; from Pierre Cretaceous of the South Fork, Cheyenne, South Dakota. Wellcome Collection. Source: Wellcome Collection.