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54

ADDITION: Lisa stayed behind in camp today. Shortly after noon, she saw a group of Saimiri. Apparently with at least one apella in immediate neighborhood.

Around 1:45 pm, she saw one apella (perhaps the same individual) and heard others. (This time) apparently alone.

The Saimiri and apellas, and the last mixed group seen by us this afternoon, may have been (or included) some of the individuals seen in the mixed group of the same species on previous days. 

COMMENTS: Heriberto says that Woolly and Spider Monkeys occur in exactly the same trees here. And feed on the same fruits. (This, of course, is more evidence that food- at least for some species- see also below- is superabundant.) But H. also says that Spiders and Woollies never associate with one another. Special avoidance mechanism? 

The general rarity of Howler Monkey here may be partly due to disease. Or to some special ecological preference which is not shared by the howlers of BCI. But it also occurs to me that they may be one of the very few species here which is food-limited. There seem to be remarkably few fig trees around here. Certainly relatively fewer than on BCI. 

September 10, 1968
La Deseo

Rained all last night. But clears up at dawn. 

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