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Echidna, Australia (USNM 238461)
The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many monotremes in its scientific collections.
This specimen, USNM 238461 (http://collections.nmnh.si.edu/search/mammals/?irn=7283144), is a short-beaked echidna (Tachyglossus aculeatus setosus) from Australia. This specimen was collected by C. M. Hoy near Tasmania.
This is a CT scan of the mandible of USNM 238461. 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.
The main goal of this joint initiative between the Human Origins Program and the Division of Mammals is to make the NMNH's scientific collections of our closest living nonhuman primate relatives available in 3D for education and research.