. 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. 100% TBW I00%TBW choloepus #2 Figure 2. Terrestrial forms-segment figures. A. Dasyprocta. B. Figure 3. Arboreal forms-segment figures. A. Alouatta. B. MacTopus. Choloepus. from percent to percent TBW in the howler monkey and sloths. In the two Choloepus, it averages percent TBW; in the Bradypus, percent TBW. Britton and Atkinson (1938) give 25 percent TBW for B
. 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. 100% TBW I00%TBW choloepus #2 Figure 2. Terrestrial forms-segment figures. A. Dasyprocta. B. Figure 3. Arboreal forms-segment figures. A. Alouatta. B. MacTopus. Choloepus. from percent to percent TBW in the howler monkey and sloths. In the two Choloepus, it averages percent TBW; in the Bradypus, percent TBW. Britton and Atkinson (1938) give 25 percent TBW for Bradypus (see Table). Bone varies from 11 percent to 19 percent TBW; Britton (1941b) estimates 20 to 25 percent TBW for the sloth. The concentration of bone in tail and hindlimbs of the kangaroo should be noted. The weight of stomach and intestines varies from 6 percent to over 30 percent TBW. Unfortunately, these data are difficult to compare with published ob- servations. Dissection procedure as well as terminology differs: offal, abdominal viscera, stomach and in- testines, wet or dry weight, and surface area (Moir, 1968; Hladik, 1967). Nevertheless, the high percen- tage corresponds with Beebee's (1926) report of percent (abdominal viscera in Bradypus) compared with 25 percent (in Dasyprocta). Britton (1941b) notes 25 percent TBW (stomach and intestines in Brady- pus). Segmental distribution of weight (Figures 2 and 3). — This biomechanical method provides a transition to locomotor analysis. In addition, it illustrates the bone- skin-muscle distribution about the body core. In Dasyprocta aguti, the agouti (Figure 2A), 20 per- cent of the TBW is concentrated in the hindlegs, percent in the forelegs. The tail is vestigial. At 7 percent TBW, the thigh is the heaviest segment; at percent or less, the feet, forearms, and forepaws are the lightest. Most of the weight (75 percent TBW) is concen- trated in the trunk and head. The composition of tissues follows: skin 9
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