The 13,000-year-old partial tusk of an adult mammoth found in western Siberia has four images of two-humped camels engraved on it. The 13,000-year-old engraved mammoth tusk from the Tom River, western Siberia. Image credit: Esin et al, doi: 10.1016/j.ara.2020.100180. The engraved tusk was found in 1988 at a locality known as Parusinka in the lower reaches of the Tom River. The artifact, which measures about 70 cm (27.6 inches) in length and 10 cm...