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[[circled]] 3 [[/circled]]
[[underlined]] Ateles fusciceps [[/underlined]] Oct. 2, 1958, III

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This afternoon L seemed to get over his shyness, and then, whenever I approached, would start Barking. This performance quite as described by Carpenter. A more or less long series of Barking Notes. I shall call this performance B. Sounded quite like some of the barking notes uttered by Howler Monkeys before uttering the full long-drawn howling roar. Considerable variations Some of the barks more plaintive than others. The plaintive ones sounded quite like some of the notes of Red-throated Guans!
The variations in the sound of the B notes obviously correlated with different actual & relative strengths of the attack & escape drives.
Some quite aggressive. Deeper, harsher, & more grunt-like than the other B notes. Call this Agg B. Often accompanied by little lunges toward me, also jumping up & down, on branches above me, just like capuchins preparing to break off branches to drop.
The agg B performances were relatively rare. The attack & escape drives seemed to be nearly balanced in much of the B.
The Agg B notes were apparently always monosyllablic, and so were some of the other, ordinary B notes (Ord B), especially the low intensity notes at the start of a long series of B. But the obviously higher intensity B notes tended to break up. (These were obviously high intensity because the animal ran around the cage in a relatively rapid and unmistakably excited manner.) Essentially disyllabic.  Might