. 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 . o. 1 - 6 - 12  = 26,10. - 1.11, 13 - 22  = 7,11. 15.11 - 23 - 28  = 21,11. - 26.11. 29 - 34  = 5,12. - 10.12. 35 - 39  = 15,12. - 19.12. 40 - 4b  = 28.12. - 3.1. 47 - 52  = 7. 1. - 12.1. La figure 1. Les itinéraires parcourus par le groupe. Les nombres sont attachés à l'arbres à dormir (cercles) pour différents jours d'observation. Les dates exactes sont compilées dans le coin supérieur droit. Résultats de la composition du groupe, les groupes voisins, et accueil Le groupe la gamme observer

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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 . o. 1 â 6 - 12 = 26.10. - 1.11, 13 - 22 = 7.11. - 15.11 23 - 28 = 21.11. - 26.11. 29 - 34 = 5.12. - 10.12. 35 - 39 = 15.12. - 19.12. 40 - 4b = 28.12. - 3.1. 47 - 52 = 7. 1. - 12.1. Figure 1. Routes traveled by the group. Numbers are attached to the sleeping trees (circles) for different observation days. The exact dates are tabulated in the right corner. Results Group composition, neighboring groups, and home range The group observed (Group A) consisted of one old male (characterized by very sparse fur and a large subcutaneous swelling caused by botfly larvae on the right side of the thorax); a smaller, younger male; a female (characterized by a swollen vulva which re- mained in that state even when she gave birth to a male baby between November 27 and December 4, 1974); a younger female (with thick black fur and a small vulva); a juvenile (with a swelling on the neck); and a smaller juvenile. Because of the characteris- tically marked old male, I could identify the group easily. The route Group A traveled during the period from October 11 to January 12 (shown in Figure 1) gave a rough estimate of the range the group oc- cupied at that time. The home range covered about 125 ha, much higher than values previously recorded (Coelho, 1974). No other groups were seen within this range. One other group (quadrat C/2) consisting of one male, two females, and one juvenile female, was de- tected to the north. I heard roaring north of the air- field in quadrat F/3 and south in D/7, but could not locate the animals. I found one solitary male in E/8, south of the home range of Group A. Near the "Bat Palace, " I met a single female with her juvenile (fe- male). I followed her for 2 days without meeting other howlers as she traveled toward Complex L. This lack of other howler groups in the vicinity of Group A

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