Isn’t culture supposed to be what separates us from the animals? Now what does humanity have that sets us apart, just toilets and puns? Live Science writes:
These chimp handshakes, which are seen only among some of the primates, seem to differ from group to group in ways that aren’t dependent on genetics or environment. That leaves cultural differences between groups as a possible explanation.
This behavior was first seen in a group of chimps in Tanzania, and has been observed in at least 15 other groups as well. The fact that the behavior is long-lasting and appears to be passed down through generations suggests that the handshakes may be a rudimentary form of culture.
Two groups [observed over several years] were big into hand-clasping, but there were differences. Group 1 almost always grasped their hands palm-to-palm, while Group 2 hooked their wrists around each other instead. The researchers have also observed young chimpanzees learning the hand clasps from their elders. About 80 percent of the time, juvenile chimps first practice the hand-grabbing grooming with their mothers, the researchers found.