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Echidna, Australia (USNM 221095)

The Smithsonian Institution’s Division of Mammals ( houses many monotremes in its scientific collections. 

This specimen, USNM 221095 (, is a female short-beaked echidna (Tachyglossus aculeatus aculeatus) from Australia. This specimen was collected in 1919 by C. M. Hoy near Gloucester, New South Wales. This individual measured a total length of 425 mm, a tail length of 71 mm and a hind tarsus length of 78 mm.

This is a CT scan of the cranium of USNM 221095. 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 (, 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.