. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 2. Guereza sits feeding on medium sized horizontal branch. The posture is stabilized by foot grips and one hand grip while leaves are gathered with the free hand. Figure 3. Guereza stands bipedally on sloping medium-sized branch of fig and gathers fruit with free hand. progression was usually a troop activity involving a series of fairly short moves separated by short periods of resting, and usually involved a major change o
. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . Figure 2. Guereza sits feeding on medium sized horizontal branch. The posture is stabilized by foot grips and one hand grip while leaves are gathered with the free hand. Figure 3. Guereza stands bipedally on sloping medium-sized branch of fig and gathers fruit with free hand. progression was usually a troop activity involving a series of fairly short moves separated by short periods of resting, and usually involved a major change of location. Progression preceding or following a feeding period involved the use of habitual pathways through the canopy along which troop members traveled one after the other. These pathways were mostly made up of medium-sized branches with a minimum of gaps that required crossing by leaping. There were usu- ally a number of available pathways along branches, but they all tended to converge on leaping sites where the characteristics of the takeoff and landing sites were well known to the animals through frequent use. There were only 3 sites within the home range that required leaps of more than about 3 m to be made, and even these were easily negotiated by the youngest troop members capable of independent pro- gression (Figure 4). Leaps occurred on average nearly 7 times per hour of feeding and progression associated with feeding. Horizontal or sloping branches were favored both as takeoff and landing sites (Table 5). Medium-sized branches were favored for both takeoff and landing, although small-sized branches were used fairly fre- quently (Table 6). Food plant use About half the feeding time was devoted to acacia leaf, with unripe acacia fruit and unripe fig fruit forming other staples (Table 7). Leaves of a variety of other plants made up the rest of the diet. These other plants were rarely used as the main food source during any particular day but were used at the end of a
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Keywords: ., bookcentury1900, bookcolle, booksubjectleaves, booksubjectmammals
