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Then adults discover us. Immediately begin to utter new notes. "Kruk", "Kurruk", "Kururuk". Usually single Repeated at frequent but  irregular intervals. Very occasionally double. Obviously homologous with Trll of Saguinus, but much lower pitched. Very squirrel-like. (I shall call it "chuck-Trll" for the time being.)

[[symbols describing the sound pattern]]
 
Adults still continue WLW's in between Chuck-Trll's but much less frequently than before. Also give a few single Wstl's. Apparently scattered at random. There seem to be 3 adults. Not all giving same calls at same time.

Young continues to give WLW's. Not noticeably more or less rapidly than before. An  WLW by the young often provokes burst of unusually loud, rapid and intense Chuck-Trll's.  

Adults circle around apparently trying to get to young without approaching us male advances and retreats. During advances, I can hear that Chuck-Trll's are interspersed with much softer little "chatters" of low moans or moan-whistles. Ind. notes short. This pattern presumably homologous with TW of Saguinus. 

At this stage adults are usually fairly low. 5-20 ft up. In bamboo leaping vertically from trunk to trunk. Tail usually with Tip-coil and some TR. Lots of SS. Quite slow but stereotyped. Chuck-Trll's often during SS. Mouth apparently not opened widely. Dark inside. Very inconspicuous visually.   

Ca. 8:45 Saguinus shows up. Can hear typical fuscicollis Trll's in distance.