. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 1. Mature acacias in northern part of home range. Trees reach up to 30m in height. Ground cover is mainly grass as a result of scrub clearing. Guerezas come to the ground here mainly to play or progress to other parts of the home range. Acheson (1971), Groves (1973), and Morbeck (1974 and 1975). More specific information on feeding behavior is available from the studies of Clutton- Brock (1974a), Dunbar and Dunbar (1974), Oa
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 1. Mature acacias in northern part of home range. Trees reach up to 30m in height. Ground cover is mainly grass as a result of scrub clearing. Guerezas come to the ground here mainly to play or progress to other parts of the home range. Acheson (1971), Groves (1973), and Morbeck (1974 and 1975). More specific information on feeding behavior is available from the studies of Clutton- Brock (1974a), Dunbar and Dunbar (1974), Oates (1974, 1977), Struhsaker and Oates (1975), and Mc- Key (1978). The Study Area The study site is an area of riparian acacia forest on the shore of Lake Naivasha in the Rift Valley of Kenya, East Africa, at an altitude of 1884 m above sea level (Figure 1). A grid of 30-by-30-m quadrats was mapped over an area within which the guereza troop ranges, and the position of all trees over 3 m high within each quadrat was plotted. Fever trees (Acacia xanthophloea) form 58 percent of such trees, pepper trees (Schtntus molle) 16 percent, fig trees (Ficus vallis - choudae) 13 percent, and 15 other species of trees the remaining 13 percent. The peppers and most of the trees in the last group are domestic trees grown wild. They originated in an orchard and garden that were maintained in the study area up to about 30 years ago (D. Iceley, personal communi- cation). The northern two-thirds of the study area, which includes the base of a lava ridge running parallel to the lake, contains mostly mature trees ranging from about 10 to about 30m in height, while the southern third consists mainly of regenerating acacias reaching a maximum of about 7 m in height. Ground cover consists of low bushes, creepers, and vines in the southern half of the area, and meadow, resulting from clearing to provide grazing for cattle, in the northern half. There is a mean of 60 trees over 3 m tall per ha, although
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