The bones were found in El Salto, Durango State, northern Mexico, in a cave hamlet built into a cliff.
The site - called Cueva del Maguey - dates back to around 1425 and was formerly home to the Xiximes tribe.

Rumours of cannibalism among the 5,000-strong Xiximes have long existed due to the historical accounts of Jesuit missionaries, which labelled the tribe 'the wildest and most barbarian people of the New World'.