Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago. Scientists suspect this ...

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows.. Chimpanzees and humans last shared a common ancestor around 6 million years ago.Scientists suspect this ...

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago. Scientists suspect this ...

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago.

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago.

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago. Scientists suspect this ...

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago. Scientists suspect this ...

Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows. Chimpanzees and humans last shared a common ancestor around 6 million years ago. Scientists suspect this ...

By CHRISTINA LARSON. Chimpanzees drum with regular rhythm when they beat on tree trunks, a new study shows.. Related Articles. How client advocates are quietly reshaping criminal defense Husband ...