Chimpanzees walk on the knuckles of their hands and soles of their feet. This is called "knuckle walking." They not only walk this way, but they can also walk bipedal (like how we walk.) A chimpanzee would walk bipedal if he or she wanted to see over tall grass or was carrying something. Although chimpanzees spend most of their time on ground, they are also expert climbers. Chimpanzees can branchiate when they are in trees.
Although chimpanzees spend most of their time on the ground, but they sleep in trees. Sleeping in trees helps protect the chimpanzees from predators. They make nests of vegetation woven into a mattress. They are made at the fork of a tree, about nine to twelve feet from the ground. This provides a good bed where they can sleep at night. One chimpanzee or a mother and child usually occupies a nest. Rarely, there will be three (mother and two children.)
Chimpanzees are socially advanced beings. Food is shared about fifty percent of the time that it is asked for. One amazing fact is that chimpanzees make and use tools to make life easier. For example, a chimpanzee may crush leaves and use them as a sponge to get water out of a hollow tree. Another is "fishing" for termites with a twig. After Jane Goodall observed this she sent a letter to Louis Leakey (anthropologist; discovered "Lucy"). He sent back a famous telegram that stated, "Now we must redefine tool, redefine man, or accept chimpanzees as humans!"
The chimpanzees at the North Carolina Zoo do not have a real termite mound, but there is a fake one for representation in their enclosure. The zookeepers simulate the interior of the termite mound by placing a board with Dixie cups on it inside the mound. The cups are filled with honey, mustard, or yogurt. The chimpanzees are given a stick to use to dip and get the contents of the cups.