Abstract
Red uakari (Cacajao calvus ucayalii) living near the Communal Reserve Tamshiyacu-Tahuayo in northeastern Peru frequently associate with other species of primate, especially the woolly monkey (Lagothrix lagotricha). In 42 observation follows over 14 months (April 1993 – December 1994), the uakari were in association with other species for all or some portion of time during 62% of the follows. Woolly monkeys were present during 65% of the polyspecific groupings. During 151.5 hr of timed observations, the uakari spent 29.21% of their time with other species, and 76% of their associative time with woolly monkeys. The participants of the associations may benefit from increased predator protection and more efficient use of resource. These data represent the first published notes from a long-term behavioral ecology study of red uakari.
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