. 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. climbing (Figure 5,6) continuous progression, often vertical, involving various combinations of 3 or more limbs. Arms are used primarily to pull the body up while hindlimbs push. armswinging (Figure 7) bimanual progression. Observations were made by following adult indi- viduals during daily activities and recording the se- quence of individual locomotor bouts (modified after Pros
. 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. climbing (Figure 5,6) continuous progression, often vertical, involving various combinations of 3 or more limbs. Arms are used primarily to pull the body up while hindlimbs push. armswinging (Figure 7) bimanual progression. Observations were made by following adult indi- viduals during daily activities and recording the se- quence of individual locomotor bouts (modified after Prost, 1965), the distance traveled during the bout, and the size of the substrate providing support. A sample of traveling behavior might be recorded as follows: Quad —5 meters- Leap —10 meters Rest Quad —6 meters —branch bough branch to branch Arboreal supports were grouped into 3 categories on the basis of estimated diameter — bough (>10 cm), Pmelalophos branch (2 cm), and twig (<2 cm). For analysis, observations were divided into 2 cate- gories on the basis of associated activity: (1) locomo- tion during travel, movement to and from sleeping trees or between food sources; and (2) locomotion during feeding, movement during a feeding session, within a single food tree or group of trees and vines. The percentage of bouts of different locomotor patterns and the average distance traveled per bout are given in Table 1. The 2 species show significant differences in the relative use of locomotor patterns during travel (Figure 8) (x2 test, P < .05). Quad- rupedal walking and running account for over 50 percent of the observations of P. obscura, but only 20 percent in P. melalophos. Leaping and hopping account for 67 percent of the bouts of P. melalophos, but only 40 of those for P. obscura. Climbing is equally common in the 2 species; only P. melalophos progresses bimanually. In P. melalophos, bout lengths are similar for Pobscura TRAVEL TRAVEL. QUAD ARMSWING. Please
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