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101

They are far away. Do they have comparatively large territories?
  10:55 am. See another large mixed flock without monkeys
  12:10 pm. Off on another side path. Region of what looks like moderately old second growth, 30-40 ft high, in midst of mature forest. Startle a single Callicebus torguatus from tangle 25 ft up.  Apparently quite alone. Runs off individually.  Silently. (NOTE: This ind. looks quite like captive on BCI. Definitely reddish above.)

  There is a palm nearby.  Apparently same species as the one on which the other torquatus were seen to feed a few days ago.  It is quite possible that the ind. seen today had just come from this palm.  (Suggested by some sounds of moving branches.

  After the ind. leaves, I hear peculiar sounds from the direction in which it went.  Series of notes.  Usually begin with 3 fairly low pitched "Tuk" Notes.  Followed immediately by 4 to 20 (approx) rather melodious "Kow" Notes.  Latter are very tragon-like. Series usually rises and then falls, I think.  Unfortunately, I can't see performing
animal.  Of course, it may have been a tragon.  If it was the torquatus, I presume that the "Tuk"s are homologous with the "Chuk"s of moloch, and that the "Kow"s are some form of Resonating Note.

  ADDITION: the vegetation in this second growth area was dense. But only moderately so.

  1:25.  See another mixed flock without monkeys.
  
  No trace of Sakis where they were seen first day. 

  Stopping observations 1:45 pm.