Biology, 28.08.2019 14:30, katherineweightman

At the zoo, a group of chimpanzees has found a way to groom each other with branches from a fake tree in their cage. the younger chimpanzees invented this grooming technique and are passing it on to their peers and offspring. thus, they are:

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At the zoo, a group of chimpanzees has found a way to groom each other with branches from a fake tre...