Why do gorillas beat their chests (and why is science so great)?

It’s impressive to see a gorilla beat its chest. But why do they do it? We’ve tackled this question before, but there’s a new scientific scoop about this primate percussion! We asked primatologist Andrea DiGiorgio to tell us about it. Got a question that you want to get off your chest ? Send it to us at BrainsOn.org/contact , and we’ll get an answer ready to GO(rilla). See omnystudio.com/listener for privacy information.