Guenon, Kenya (USNM 452510)

USNM 452510

Old World monkeys are primates and are more closely related to humans and apes than any other living nonhuman primate group. The Smithsonian Institution’s Division of Mammals ( houses many Old World monkeys in its scientific collections. 

This specimen, USNM 452510 (, is a male Schmidt’s guenon (Cercopithecus ascanius schmidti) from Kenya. This individual was collected in 1960 by C. P. Booth near Dimbilil Farm in Kericho District of Rift Valley Province. This individual weighed 13.75 lbs, had a total length of 1185 mm, a tail length of 645 mm, and a head to body length of 540 mm. The hind tarsus length measured 144 mm and the ear notch length measured 29 mm.

This is a CT scan of the cranium of USNM 452510. These three-dimensional scans are made publicly available through the generous support of the Smithsonian 2.0 Fund, provided from the annual gifts of the Smithsonian National Board to the Secretary to use at his discretion (, and the Smithsonian Collections Care and Preservation Fund.

The main goal of this joint initiative between the Human Origins Program and the Division of Mammals is to make the NMNH's scientific collections of our closest living nonhuman primate relatives available in 3D for education and research.