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Sometimes less.  Alternated with bursts of high, hard "Tsit" Notes. Obviously alarm and LSN's. At first I thought that all of them these must be uttered by birds. But then I see single tamarin. Running head-down down large vertical trunk. 30-20 ft up. And a minute later, see another on horizontal branch, possibly 50 ft behind, also 30 ft up.

  Whistles and LSN's definitely seem to be coming from area of first tamarin. But animal is moving so fast that I can't see mouth movements. Both animals move away immediately, and sounds stop at same time. Then  it seems safe to assume that the Whistles and LSN's actually were uttered by the tamarins.

  Unfortunately the tamarins were seen too briefly to make certain of their specific identity.  But they certainly were "Bebileches", And small. Presumably Trizonal.

  I got the definite impression that the vocalizations of the tamarins were provoked by those of the titis!!! (I couldn't tell if the Whistles and/or LSN's of the tamarins continued during the Songs of the second pair of torquatus. The Resonating notes were too loud.)

  The tamarins passed just under the trees from which the second torquatus Song came. I.E. the territories of the two species are at least partly overlapping. Perhaps the torquatus and Trizonal here are partly segregated by height in much the same way as the sakis and fuscicollis in the Caque tá?

  A few minutes later, see second pair of torquatus. Identification definite. Apparently only two inds. First seem