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Why are human babies so vocal?

Thanks Protexya, but in all the Nature programmes I've seen lion cubs are almost silent, barely louder than a domestic cat. It is the adults who roar, not the infants.
SmartAZ, we humans certainly primarily communicate via speech, but it is not our only form of communication, and in many societies, and certainly in most non-western societies, babies are actually kept close to the mother in early infancy so the need for loud crying would seem doubtful.

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