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Extra info for Amazing Animals (Scientific American Special Online Issue No. 16)

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They then hit the bugs repeatedly before eating them. absent Clasping arms overhead Two chimpanzees clasp hands above their heads while grooming each other with the opposite hand. absent Knocking knuckles To attract attention during courtship, chimpanzees rap their knuckles on trees or other hard surfaces. habitual Rain dancing At the start of heavy rain, adult males perform charging displays accompanied by dragging branches, slapping the ground, 42 SCIENTIFIC AMERICAN EXCLUSIVE ONLINE ISSUE COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC.

Some scientists define mented with a host of less useful actions. Interestingly, some of the results from the experiments a cultural trait as one that is passed down not by genetic inheritance but instead when the younger generation involving the artificial fruits converge with this idea. In one copies adult behavior. If cracking open a coula is some- study, chimpanzees copied an entire sequence of actions thing that chimpanzees can simply figure out how to do they had witnessed, but did so only after several viewings on their own once they hold a hammer stone, then it can’t and after trying some alternatives.

For example, all chimpanzees dispatch parasites found during grooming a companion. But at Taï they will mash the parasites against their forearms with a finger, at Gombe they squash them onto leaves, and at Budongo they put them on a leaf to inspect before eating or discarding them. Each community has developed a unique approach for accomplishing the same goal. Alternatively, behaviors may look similar yet be used in different contexts: at Mahale, males “clip” leaves noisily with their teeth as a courtship gesture, whereas at Taï, chimpanzees incorporate leaf-clipping into drumming displays.

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