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[[circled]] 4 [[/circled]]

[[underlined]] Ateles fusciceps [[/underlined]]. Oct. 2, 1958, IV.

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possibly be transcribed by something like "Ooh-uh". At the highest intensities, there seemed to be an additional quaver which developed (to give [[image - line drawing with curves to indicate changes in vocalisation; sound waves]] instead of [[image - line drawing flat to indicate constant vocalisation; sound waves]]); or, even, in some cases at least, a sort of "Ratchet" undertone under the last half of the bisyllablic note. I might mention, in this connection, that the preliminary grunts or barks of at least some Howling Monkeys before dawn are actually pure "Ratchet", without any real "throaty" roar or howl at all.)
I think that perhaps the most "Guan-like" notes contained the relatively strongest escape component.
In general, L usually uttered its B notes in very long series. Once uttered continuously for 25 minutes, with only one interruption, of not more than a minute. Another case in which a relatively small amount of motivation seems to produce an enormous effect - as L certainly wasn't wildly excited continuously all this time. 
In such long series, L would vary the different types of B notes, usually gradually, apparently according to circumstances.
Low intensity B notes were uttered with the mouth closed. Higher intensity notes with the mouth open, and rather "pursed", jaws probably moving, at least a little, in rhythm with the notes.
This B must, as carpenter noticed, be homologous with the "barking roars" of Howler Monkeys. Possibly also homologous with MG's of Capuchins.