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Echidna, Australia (USNM 283963)
The Smithsonian Institution’s Division of Mammals (http://vertebrates.si.edu/mammals/) houses many monotremes in its scientific collections.
This specimen, USNM 283963 (http://collections.nmnh.si.edu/search/mammals/?irn=7297895), is a female short-beaked echidna (Tachyglossus aculeatus acanthion) from Australia. This specimen was collected in 1948 by D. H. Johnson near Groote Eylandt in the Northern Territory.
This is a CT scan of the mandible of USNM 283963. 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.