Abstract # 32:

Scheduled for Thursday, August 18, 2005 03:15 PM-03:30 PM: Session 5 (Mayfair Room) Oral Presentation

Do Macaca fascicularies Use Objects to Make Noise?

A. Zeller
University of Waterloo, Dept. of Anthropology , University of Waterloo, Waterloo, ONT N2L 3G1, Canada
     After observing spontaneous manipulation of sticks rubbed on stones in a population of long-tail macaques, I initiated a research project to investigate whether the function of this object manipulation was to make a noise. Ten different objects, five hard and five softer, were placed one at a time in the naturalistic ten-acre outdoor enclosure holding three groups of thirty M. fascicularis at Monkey Jungle in Florida. I repeated the presentation of the ten objects three times, one set to each group over a thirty-day period. The manipulations of the objects were recorded using a one/zero protocol in one minute samples on a check sheet of thirty-eight behaviors. A total of 1640 one-minute samples was recorded. Because object types and animal manipulators were repeated, and different sample sizes were collected for each object, I used ordinal level frequencies to generate charts of which activities were most frequent, and chi-squares calculations to explore the association between noise production and the hard/soft variable. Sticks and stones from the enclosure were picked up and rubbed or banged on the five harder types of objects more frequently than on the five softer objects (P < .05). Hard objects were moved more frequently than soft ones to hard substrates where rubbing and banging activities produced noise. These results suggest that one function of object manipulation was to produce noise.