@wildanimalslov: The most important chimpanzee voice for daily communication is the Pant Hoot, which normally begins as a heavy audible sound that develops into high-pitched screams. First, this sound is used to establish communication between individuals who are close to each other. But it can also be used to find out where other people are or initiate group movement from one point to another. It is also used to reach the new feeding area, the limit of their territory or the new valley. To summarize, the most common loud calls heard by chimpanzees are panting hoots.