Excavations of three 850-year-old pit dwellings strewn with butchered human skeletons have yielded evidence of cannibalism in the prehistoric U.S. Southwest, according to a new report. The discoveries include the first example ever of what some scientists regard as a crucial sign of past cannibalism: a fossilized piece of human feces, also known as a coprolite, that contains the chemical residue of human flesh.
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