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is not fuscicolles. Different appearance. Brown back. (Possibly also less white on face, and longer, more nearly completely dark, tail - more Saimiri - like proportions.) Slightly different vocabulary. Different reaction to rain. Also Puiche'-like horizontal leaping and running rather than Indri-like vertical locomotion. Could these animals be nigricollis ????
My observations so far would suggest that there is absolutely nothing in the way of a special relationship between the local tamarins and Red-tailed squirrels. Not even avoidance.
I talked with our guide again about Callicebus spp. He suggests that torquatus is characteristic of the ridges and hills, and moloch of the valleys (small marshes?) between ridges. But he still insists that either can be found in the typical habitat of the other.
ADDITION: Observation at 9:45 in pouring rain Region well drained, mixed, forest. Come across group of 5 tamarins, 4 adults and 1 infant (carried on back of adult). We first heard the animals just as the rain started. They gave rather distinctive calls. Series of W's. Each note rather long and urgent but not at all plaintive. Series usually include 4-8 notes Many series preceded by brief, hard, "twitter". Comme ça : [[series of symbols describing the sound]]
It is conceivable that this vocalization is a "distress