Overview

• Researchers found cut and polished giant sloth bones in Brazil dating back 25,000-27,000 years.
• The modified bones were likely used as pendants and other ornaments by prehistoric humans.
• Findings indicate humans were present in South America much earlier than previously thought.
• Discovery adds to growing evidence of multiple waves of migration to the Americas before Clovis period.
• Experts debate validity of findings, with some remaining skeptical of conclusions.