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Gorilla Talk

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We often think that when a wild mountain gorilla beats his chest, it
means he is angry, and you'd better get out of his way. But it is really
just his way of either showing off, getting rid of anxiety, or merely
just staying in contact with his family. Craig Sholley, the explore
team's guide to the gorilla population of Rwanda, explains the nuances
of gorilla communication, from the "belch vocalization" of a content
silverback to the angry "pig grunt" of a female feeling threatened on
her own turf.