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Proboscis Monkey, Indonesia (USNM 196799)
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 (http://vertebrates.si.edu/mammals/) houses many Old World monkeys in its scientific collections.
This specimen, USNM 196799 (http://collections.mnh.si.edu/search/mammals/?irn=7266476) is a male proboscis monkey (Nasalis larvatus) from the island of Borneo, Indonesia. This individual was collected in 1913 by H. C. Raven near the Birang River.
This is a CT scan of the cranium of USNM 196799. 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 (http://smithsonian20.si.edu/fund.html), and the Smithsonian Collections Care and Preservation Fund.