Six juvenile Macaca fascicularis relatively unfamiliar with one another were placed together in a large play apparatus. The Boelkins' water test was used to establish dominance. After one hour of social interaction the animals formed a stable hierarchy. Following six days of observation of this group, the dominant male and female were removed. This removal drastically altered the behavior of the remaining animals (19 of 40 behavior categories changed significantly). A replication indicated that behavior in one group allowed predictions of future behavior in that group, but did not allow predictions to an autonomous segment of the original group.
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