A small group of chimpanzees was allowed to manipulate different quantities of novel objects in order to enhance their captive conditions. This procedure led to a general increase in the manipulation frequency by the apes. It decreased their inactivity and their self-grooming, and almost eliminated the abnormal behaviors displayed by one individual. The distribution of novel objects did not affect the total frequency of social interactions and did not increase the aggressivity of the animals, even though dominant individuals secured most of the objects when only a small number of them were available. Following their familiarization with the novel objects, the chimpanzees' manipulation frequency decreased whereas selfgrooming and abnormal behaviors were increased. Suggestions are made on how to maximize the use of a limited bank of toys to occupy captive chimpanzees.

The study of a captive group of woodchucks (Marmota monax) has confirmed the occurrence in this species of a cheek- and chin-rubbing behaviour associated with scent marking. The frequency of this behaviour is high in the spring breeding season and decreases markedly during summer, following a similar decrease in breeding activities. We found no direct relation between hierarchical status and scent-marking rates of individual woodchucks whereas a positive correlation was found between monthly rates of scent marking and agonistic interactions. Dominant individuals sometimes scent marked after agonistic encounters. Scent marking occurred most often during exploration and all individuals used the same marking sites: along paths between burrows and at burrow entrances. Despite the limitations imposed by our captivity conditions, our results seem to agree with the following hypotheses: (i) scent marking could contribute to inform conspecifics about the breeding status of each individual; (ii) in certain circumstances, it may constitute an agonistic signal and enhance the expression of dominance; (iii) it could contribute to the familiarization of the individual with its own environment.

A stable herd of 11 captive American bison (Bison bison) of known ages and social rank was studied between June 18 and August 6, 1979 at the Jardin zoologique du QuCbec, Charlesbourg, Quebec. During the 8-week study, the first author collected scan data of predefined behaviors and locations on all individuals of the herd. Space use analysis revealed extensive occupation of (and preference for) the barn and sand mound by higher-ranking animals and calves, and the tendency for lower-ranked individuals to use alternate, lower-quality sites. Overall, the herd spent an average of 40% of the daytime resting, 25% standing, 23% feeding, and 12% walking/running and group exploring. High-ranking individuals spent significantly more time standing and walking, and less time foraging than average. Most low-ranking individuals spent significantly less time lying, and more time feeding than average. Calves spent significantly more time lying than average. The extra feeding time of low-ranking individuals occurred mostly in early morning and mid-day, when the high-ranking individuals were mostly inactive. Our results suggest differential space and time use in relation to age and social status. The effects of resource limitations caused by captivity conditions, as compared with natural conditions, are discussed in regard to the activity and movement coordination of individuals in this particular captive herd. 0 1993 Wiley-Liss, Inc.

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