Smaller subgroups of 6-7 chimps stay together for a while, with the membership changing over time. These bowl-shaped nests are made out of leaves and other plant material. Nests are only shared by a mother and her nursing offspring. Young chimpanzees play a lot, learning skills they will use as an adult. They practice using tools, making sleeping nests, climbing, wrestling, etc.
Chimpanzees have a complex system of communication.
When there is an abundance of food, chimps bark loudly to call the others in their group to a feast. Chimpanzees also use many gestures to indicate needs and emotions. Chimps will beg other chimps for food by approaching them with open hands. Friends may hold hands, hug, or even kiss. A worried chimp makes a lip-puckering face.