News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   iStockPhoto |   Worth a Bark? A bonobo eats a piece of popcorn. Scientists studying bonobos at the San Diego Zoo have concluded that the great apes produce five distinct types of calls in response to food: barks, peeps, peep-yelps, yelps and grunts. | Discovery News Video   « back to article

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