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Reconstructed skeleton of a 2.1-m-tall giant ground sloth, Megalonyx jeffersonii from Holmes County, Ohio, US, mounted in 1896 (A); a 25-cm-long claw core from the right rear foot (B); and detail of the upper part of the right femur showing slices presumably made using a flint knife by a North American Palaeo-Indian approximately 13,100 years ago (C).

A gentle giant: Thomas Jefferson’s ground sloth

Professor Loren E. Babcock and Dr H. Gregory McDonald discuss the historical significance of palaeontology, focusing on key figures’ contributions to the field and their studies of the ground sloth, Megalonyx.

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