Researchers have found evidence that the practice of decapitation among Native Americans dates back way further than previously thought. In Lapa do Santo (east-central Brazil), newly found evidence of human decapitation dates back more than 9,000 years.
via Max Planck Institute:
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Few Amerindian habits impressed the European colonizers more than the taking and displaying of human body parts, especially when decapitation was involved. Although disputed by some authors, it has become widely accepted that decapitation was common among Native Americans across the entire continent. The archaeological evidence confirms that the practice has deep chronological roots. In South America, the oldest decapitation occurred in the Andes and dates to ca. 3000 years before the present. Since all other South American archaeological cases occur in the Andes (e.g., Inca, Nazca, Moche, Wari, Tiwanaco) it was assumed that decapitation was an Andean phenomenon in both its origins and in its most unambiguous expression.