Sticks and rocks are used to break open the heavy shell of some fruits and seed. The senses of the chimpanzee are similar to our own, and more than thirteen categories of vocalizations are recognized. These include soft grunts, pants, hoots and screams. Males, females and young are found in groups that vary from day to day. The relationships among these chimpanzees are very complex.
Females generally give birth by age ten to eleven in captivity and thirteen to fifteen in the wild.
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