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Siamang (USNM 519573)
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 519573 (http://collections.mnh.si.edu/search/mammals/?irn=7391046), is a female siamang (Symphalangus syndactylus). This individual had a hind tarsus length of 160 mm, an ear notch length of 30 mm, and a head to body length of 720 mm. This female was born at the San Diego Zoo in 1965.
This is a CT scan of the mandible of USNM 519573. 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.