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34 28 causally related. Valparaiso, June 10, 1968 Going to work in same forest as yesterday afternoon. Start out 6:00 am. It poured rain last night. Forest is very wet. It also looks as if it is going to rain again at any minute. Everything quiet. 6:30 am. Region of tall second growth. See pair of Sakis 40-60 ft up. Probably a pair counted earlier. One utters "Rattles", "Rattle" -- muffled roar or grunt series, one or two Roars, a very few grunts. Record these. All Roars are of very "breathy" type. Is this comparatively low intensity? Rain starts to come down in sheets -- a real tropical downpour ca 6:50 am. Continues for a long time. Finally stops 8:15 am. Sun trying to break through. But forest, of course, is dripping. 8:35 am. Region very mixed forest. See group of 4 (or possibly even 5) Sakis. 50-60 ft up in tall trees. All quite close together! 10-20 ft apart. Going in slightly different directions. Look as if they were "scattering" out from some shelter in which they had taken refuge during the storm. Possibly this species does have a social structure like Ateles! Groups and sub-groups. I notice that at least one of the animals appears to be very bedraggled indeed. I.E. the long fur is by no means