chimpsResearchChimfunshi via YouTube

Fraternities have handshakes.

Summer camps have catch phrases

Chimpanzees have arm motions.

A new study from the Max Planck institute has found evidence that individual chimpanzee populations pass down different versions of a  "grooming handclasp" as a proto "cultural tradition":

"Even between chimpanzee communities that engage in the grooming handclasp, subtle yet stable differences exist in the styles that they prefer," the study found. "One chimpanzee group highly preferred the style where they would grasp each other’s hands during the grooming, while another group engaged much more in a style where they would fold their wrists around each other’s wrists.


Here's a video of the move: