. 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. Folivores ; Écologie forestière ; les feuilles, les Mammifères Les mammifères. Tableau 5.-moyenne et l'erreur standard de la taille de l'aire d'accueil de nuit de chaque animal pour chaque année, mesurée sur les nuits uniquement. Année d'opossum n moyenne (m2) S.E. 9144 116 807 145 216 736 264 9 293 117 586 147 215 124 14 116 833 160 0-291 216 926 208 a-329 117 902 185 220 103 1019 s'est tourné vers des sites den avant la lumière du jour. Le 6 juin 1972, cependant, très grêle forte à 1850 heures

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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. Folivores; Forest ecology; Leaves; Mammals; Mammals. Table 5.—Mean and standard error of nightly home range size of each animal for each year, as measured on fine dry nights only. Opossum Year n mean (m2) S.E. 9144 1 16 807 145 2 16 736 264 9 293 1 17 586 147 2 15 124 14 0-291 1 16 833 160 2 16 926 208 a-329 1 17 902 185 2 20 1019 103 turned to regular den sites before daylight. On June 6, 1972, however, very heavy hail at 1850 hrs forced the animals to take immediate shelter; the hail turned to heavy rain squalls, which continued until after dawn, and 3 pi the 4 opossums remained under logs on the ground for the whole of the following day—a most unusual occurrence (see denning). Other aspects of activity influenced by wet weather are considered later. Although 2 factor analyses must be treated with caution, they show that the animals generally moved less in wet weather. As there was little difference be- tween the 2 years in the occurrence of dry and wet tracking nights (Table 3), the nightly ranges of each animal between years are directly comparable, but because there were variations in the animals' response to rain, comparisons between animals are not so valid. To free the comparisons of nightly ranges from this variable response, ranges on dry nights only (Table 5) were compared. In the first year there was no sig- nificant difference between the mean nightly range size of any of the animals. In the second year 9 293's mean nightly range was significantly smaller than that of the other female (p < 0.05) and those of the 2 males (p < 0.002). Female 293 had a smaller mean nightly range (p < 0.01) in the second than in the first year, and was the only animal whose range size differed significantly between the 2 years. In relating the nightly range size to measurements of excursions (Figures

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