. L'écologie des folivores arboricole : un colloque organisé au Centre de recherche et de conservation, National Zoological Park, Smithsonian Institution, du 29 au 31 mai 1975 Figure 2. cultivée . Zone d'étude et la distribution de places d'un groupe (•), Groupe B (x) et le groupe C ( o). Deux symboles de la marque l'endroit où le groupe ou au moins 1 membre a été observée. Les limites des zones - -XVII  = long lignes brisées. Les zones vides délimitées par des lignes discontinues courtes sont les marécages, les clairières, ou la végétation secondaire ; les crêtes des montagnes  = milieu lignes brisées ; ski  = les longues lignes ; rivière ou creek  =

• Contributeur: The Bookworm Collection / Alamy Banque D'Images
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. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . cultivated Figure 2. Study area and distribution of sleeping places of Group A (•), Group B (x) and Group C ( o). Two of the symbols mark the place in which the group or at least 1 member has been observed. The boundaries of the Zones - -XVII = long broken lines. The empty areas enclosed by short broken lines are swamps, clearings, or secondary vegetation; mountain ridges = middle broken lines; slopes = long lines; river or creek = thick or thin lines. preference for a certain height for various activities (for example, resting) may exist, but there were no statistically significant differences. From Table 2a, it appears that during the rainy season Groups A and B prefer the shrubs while during the dry season they like to stay in the canopy. Only for the rainy season are data available to analyze the preference of Group A for certain heights during various activities (Table 2b). It seems that Group A prefers the shrubs for resting, moving and social behavior, but at the same time looks for food mainly in the canopy. For statis- tical treatment, additional data are necessary. RELATIONSHIP TO NEIGHBORING GROUPS. The groups tolerated the presence of neighboring groups at rela- tively close distance. On 3 days (16.10, 3.11, 12.11), for example, it was observed that Groups A, B, and C retired to sleeping places in the overlapping areas, each at a distance of about 50 m. On these encounters and on the ones during 3 other occasions (17.8, 27.9, 22.10), no interactions or vocalizations that could be related to threatening, or other aggressive behavior occurred. One excited encounter of Groups A and B was recorded on January 9. This relatively peaceful reaction against strange blue monkeys in the home range stands in contrast to the results of an experi- ment carried out in the area of Group A. Upon encounterin

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