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Community
Between 15 and 120 chimpanzees of both sexes and all ages live in a group called a community. All members know each other but chimps feed, travel, and sleep in much smaller groups of six or less, called parties. These temporary parties may last from a few hours to a few days. Their membership changes when parties meet, intermingle, and disperse in different combinations or when somebody decides to drop out.
In contrast, large groups in which at least half of the community is present are called gatherings. Gatherings may last a week or more and, like parties, are flexible with individuals arriving and leaving. Gatherings are highly social events where group members play, breed, and groom. Jane Goodall describes gatherings as "the hub of chimpanzee social life."
Each community tends to occupy one area of land but they do not stay within strict boundaries, so they are called a "home range" rather than a territory. Each home range must be large enough to support everyone, so its size depends on the number of chimps and the type of habitat. The average size is between 4 - 20 square miles.
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