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this tree with four trunks definitely indicates that the relationship between the 2 species of mammals must be highly specialized. There must be some avoidance mechanism and/or overt interspecific hostility. If the latter, the Marmosets probably is dominant. If Marmosets do fight with squirrels, it might help to explain why they are so aggressive in some circumstances (e.g. when cornered by a human captor). 

Antuco called the tree with 4 trunks "guamo." Presumably an Inga. In any case, I have collected some leaves and will ask Bob to identify them. 

I had several chances to talk with Antuco during the course of the morning. He has now changed his story about the differences between large and small Pygmy Marmosets. But he seems fairly definite now. His account is as follows:

I. Large. Mostly gray above. I.E most of hairs tipped with black. Probably the extreme of what I have called "vermiculation." And dull colored below. 

II. Small. Brighter yellow below. Above like the large type or (more probably?) more visibly striped. 

Antuco sticks to his story that the two types have identical habits and occur in the same kinds of habitats. He also insists that there are no intermediates. And he implies that groups are composed of one type or the other. 

I think that these variations must be individual peculiarities (morphs) and/or sex and/or age classes. I think that I have seen intermediates. And also both types in the