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I probably missed these too. They also uttered lots and lots of very thin, very high pitched (almost ventriloquial) Whistles. At one time, almost all individuals uttering them in rapid succession. The sharp alarm notes certainly were released by, and directed toward, us. By nearly animals. The Whistles certainly were connected with our presence in some way. But possibly not (purely) hostile. Given by both near and far animals. Possibly some sort of contact call. Used to keep group together in flight. 
As far as I could tell, these Saimiri Whistles were uttered in random series. No stereotypy. 
All the animals were moving thru very mixed, largely second growth, forest. 30-50 ft up. Couldn't tell who was in lead. I did notice, however, that the Saimiri showed no hesitation about leaping on to, and running along, palm fronds. 
NOTE: According to the guide, the "Tangue", the other species of Cebus in the region (SEE BELOW) occurs in the same type of forest. But does not associate with apella and Saimiri. 
Take an hour off between 11:00 am and 12:00 am. Then start back, following much the same route as this morning
12:58. Come across group of Saimiri. In region of very mixed forest. Some tall old trees. Some young trees. Palms Tangles, etc. Probably 10-15 individuals in group. Possibly some of the same seen earlier today. But definitely alone now. No trace of apella. Animals moving at a great variety of levels. 20-60 ft up. Again showing no hesitation to move thru palms (but probably not any particular prefere