. The Ecology of arboreal folivores : a symposium held at the Conservation and Research Center, National Zoological Park, Smithsonian Institution, May 29-31, 1975 . S0NDJFMAMJJ A Year 1 972 1973 Mont hs Figure 2. Monthly temperature averages and extremes. Single line represents the maximum-minimum temperature. Double lines rep- resent the average maximum and average minimum temperatures. Mid-line represents the monthly average temperature. Howling Monkeys and Plant Secondary Compounds 563

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