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Siamang, Indonesia (USNM 271048)
Siamangs are apes and one of our closest living relatives. The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many siamangs in its scientific collections.
This specimen, USNM 271048 (http://collections.mnh.si.edu/search/mammals/?irn=7294043), is a female siamang (Symphalangus syndactylus) from Indonesia. This individual was collected by F. Ulmer near Gunong Shaitan of Atjeh Province on the island of Sumatra.
This is a CT scan of the mandible of USNM 271048. 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.