Rockstar Chimps

Deep in a remote woodland in Guinea-Bissau. The air is thick with the buzz of insects and the calls of hidden birds. You push through vines and suddenly… you see it. A massive tree, its trunk covered in old scars. At its base, a neat pile of rocks, dozens of them, accumulating like some forgotten offering. No obvious reason. No nuts scattered. No fruit knocked down. Just stones. And every so often, from somewhere in the canopy or distance, comes a deep, resonant THWACK… followed by wild whoops that carry for kilometers.

What you’re witnessing isn’t random. It’s deliberate. It’s repeated. And it’s been going on for years in specific groups of our closest living relatives: chimpanzees.

This is the strange and beautiful story of accumulative stone throwing. A behavior so intriguing that scientists are still unraveling its meaning. And yes… some have playfully called it the chimps’ version of “rock music.” Stick around, because the truth is even more fascinating than the mystery. This is Episode 43: Rockstar Chimps

Sources

Kühl, H. S., et al. (2016). Chimpanzee accumulative stone throwing. Scientific Reports, 6, 22219. https://www.nature.com/articles/srep22219

Kalan, A. K., et al. (2019). Chimpanzees use tree species with a resonant timbre for accumulative stone throwing. Biology Letters, 15(7), 20190747. https://doi.org/10.1098/rsbl.2019.0747

Nakano, R. & Kalan, A. (2026). Why do male chimpanzees throw rocks at the same trees for more than a decade? We travelled to remote Guinea-Bissau to find out. The Conversation. https://theconversation.com/why-do-male-chimpanzees-throw-rocks-at-the-same-trees-for-more-than-a-decade-we-travelled-to-remote-guinea-bissau-to-find-out-279187 (also published/adapted on SciTechDaily)

Additional context comes from the Pan African Programme’s long-term observations and related primatology reports on western chimpanzee behavior and conservation threats.