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Echidna, Australia (USNM 283961)

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

This specimen, USNM 283961 (, is a  male 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 individual measured a total length of 555 mm and a hind tarsus length of 77 mm.

This is a CT scan of the cranium of USNM 283961. 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.