Chimpanzees Throw Rocks at Trees for Over a Decade

Topic: Environment

Researchers observed chimpanzees in Guinea-Bissau throwing rocks at specific trees and returning to these sites repeatedly. This behavior is rare and may be cultural, helping scientists understand complex communication and stone tool use.

In the savanna-woodland landscape of Boé National Park, Guinea-Bissau, you might find a tree with gnarled scars and rocks surrounding its base. This could be evidence of a unique chimpanzee behavior called accumulative stone throwing. Video recordings show adult male western chimpanzees throwing rocks at specific trees and returning to these sites repeatedly.

The chimpanzees also pant hoot, a loud communicative signal, while throwing rocks. They sometimes hit their hands and feet on the tree in a behavior called buttress drumming. This display is part of the male chimpanzee's common behavior, suggesting that accumulative stone throwing might be a modification of this behavior.

Researchers collected data to investigate the social and ecological context of accumulative stone throwing. They set up cameras and recording devices at the sites and observed the chimpanzees' behavior over several days. The team hopes that understanding this behavior will help them understand the emergence of complex communication and stone tool use in humans.

Accumulative stone throwing is a rare example of stone tool use in a social context. It has been observed in only four chimpanzee groups in West Africa to date. Researchers believe that these sites might mark important locations within the chimpanzees' territory, but they still don't know what accumulative stone throwing means to the chimpanzees themselves.

Why It Matters

Understanding how animals communicate and use tools can help us better understand human evolution and behavior. This research can also inform conservation efforts for chimpanzee populations in West Africa.

Key Facts

• Researchers observed chimpanzees throwing rocks at specific trees in Guinea-Bissau's Boé National Park.
• This behavior is rare and has been seen in only four chimpanzee groups in West Africa.
• Accumulative stone throwing may be a cultural behavior, helping scientists understand complex communication and stone tool use.
• The researchers hope that understanding this behavior will help them understand human evolution and behavior.
• Conservation efforts for chimpanzee populations in West Africa can benefit from this research.

Key Terms

Accumulative Stone Throwing

A rare example of stone tool use in a social context, where chimpanzees throw rocks at specific trees and return to these sites repeatedly.

Buttress Drumming

A behavior where chimpanzees hit their hands and feet on the tree while pant hooting.

Implications

Understanding how animals communicate and use tools can help us better understand human evolution and behavior. This research can also inform conservation efforts for chimpanzee populations in West Africa.