Overview
- Ayumu, a captive chimp at Kyoto University’s EHUB, was documented removing floorboards to use as drumsticks while producing vocal‑like sounds, with 89 performances filmed from February 2023 to March 2025.
- The peer‑reviewed study in Annals of the New York Academy of Sciences reports non‑random sequences and isochronous timing, meaning a steady, metronome‑like beat that was most stable when tools were used.
- Facial cues such as a relaxed “play face” often appeared during the displays, which the authors say points to positive emotion that may be expressed through instrumental sound rather than voice alone.
- The team plans to study how other EHUB chimpanzees react to these displays, and a separate preprint describes similar drumming and expressions in another captive chimp named Toon.
- Because early percussion tools rarely survive in the archaeological record, detailed primate observations like these help test ideas about the roots of musicality, though the captive setting and single‑individual focus limit broad claims.