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Orangutan, Sumatra (USNM 267325)
Orangutans are great apes and one of our closest living relatives. The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many orangutans in its scientific collections.
This specimen, USNM 267325 (http://collections.mnh.si.edu/search/mammals/?irn=7292666), is an adult male orangutan from the island of Sumatra, Indonesia (Pongo abelii) that was collected at Adji in Kuala near the Simpang River in 1937.
This is a CT scan of the mandible of USNM 267325. 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).