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Macaque, Thailand (USNM 256825)
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 256825 (http://collections.mnh.si.edu/search/mammals/?irn=7289131), is a male stump-tailed macaque (Macaca arctoides) from Thailand. This individual was collected in 1930 by H. M. Smith near Kao Luang, Huey Yang.
This is a CT scan of the mandible of USNM 256825. 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.