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individuals eventually went off in one direction. The other two in another direction.

Thus, this group would appear to have been strictly comparable to the group of 4 which Mike saw the first day here. 

Either both groups were composed of two separate pairs near the common boundaries of their territories. And/ or individuals of this species are members of large groups which split up during the day. Like Red Spider Monkeys.

Finally stop observation 3:50 pm. Just as rain starts to pour again.

ADDITION and CORRECTION. Just before we left the forest, I heard many whistles. Single notes. And 2, 3, 4, and 5 note series. Very, very reminiscent of the LW of Pinchés. Almost certainly the same as the "LW" I heard several days ago, while approaching the band of fuscicollis which later performed extreme Mobbing. The "LW" which I thought must also be uttered by fuscicuollis. This afternoon, however, the whistles were not associated with, or followed by, any (other) characteristic fuscicollis vocalizations. Nor could I see any tamarins around in the neighborhood. And then the guide tells me that these whistles are well known to be the call of a small parrot!!!!! And I think that he must be right.

So fuscicollis probably does not have an LW after all! 

It should be stressed, nevertheless, that the resemblance between this parrot call and the LW of the Pinché is really quite uncanny. The occurrence of this pattern in the parrot repertory, and the absence of an LW in the fuscicollis repertory, may well be