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21 15

"confined" to "vegas." Doesn't occur in the high forest at all. 

  ADDITION: Owner of the finca says that there probably also are a few howlers still around. But again must be rare. We didn't hear them during the rain

Santa Rita 
June 6, 1968

  Going to try some forest again today. Without much hope. It rained all night. Just stopping at dawn. But it is still heavily overcast. And forest must still be dripping.

  Start out 6:20 am. Forest is just as wet and noisy as I feared it would be. Walk through several miles of forest without seeing anything. 

  Then, 9:05 am, see pair Sakis. In region second growth forest 30-40 ft up (as high as they can get in this type of forest) Of course, they see us as soon as we see them. Lots of vocalizations. [[left margin]] 8 [[/left margin]] Begin with "Rattles." Rather soft, then, relatively high pitched, possibly slightly plaintive (!) in tone. Then, apparently as the animals lose their first fear, lots of louder, harder, "Rattles." Some ending in muffled Grunts or Roars. Also a lot of "pure" Roars. Some single and wheezing. Others in growling "series." Then animals seem to relax a little. Go back to uttering only relatively high pitched "Rattles." Then fall silent.

  This sequence would suggest that "Rattles" are both lower intensity and/or contain more escape than Roars and (pos