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Abstract

The range of elevated positions in which captive Cercopithecus aethiops monkeys held their tails is apparently a continuum of display behavior. Different positions correlated with different behavior: Any might be adopted during a great diversity of activities, but with the more anterad positions a monkey might forego non-agonistic behavior to attack, and with the more posterad to withdraw. When the tail was held straight upright locomotion for any end was momentarily improbable.