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[[underlined]] Ateles [[/underlined]] ssp., Oct. 29, 1960, VI. [[circled]] 39 [[/circle]]

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large felines. Very variable in length sometimes long and continuously sustained. More often broken up into separate notes; but the separate notes are always or about always longer than any B Notes.

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   These Roars also sound very much like low-pitched versions of Screams (although they occur in very different circumstances -- see also below); and their signal effect is at least sometimes similar in some ways. The adult ♂ Red spends most of his time sitting on top of the cage of the Blacks. He usually does not respond when the Blacks NYB or MO at me. But when the ♂ Black Roars, the ♂ Red usually rushes over toward me, apparently preparing to attack. Just as the other adult ♂ Red I had (the one who is over by [[Tuertes?]] House) attacked me when I picked up a young one and it screamed.

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   Since the Black ♂ Roars at me now, when he no longer utters Agg B, the Roar must be either lower intensity than Agg B or contain a friendly component absent in Agg. B. Quite possibly the latter. The deep throaty quality of the Roar is not unlike the quality of the undoubtedly partly friendly NYB (see below). It is probably relatively less friendly, however, than the NYB, as it is apparently never uttered during friendly wrestling between the ♂ and ♀'s (see below). (In any case, friendly or not, the Roar is [[underline]] undoubtedly [[/underline]] very aggressive.)
   The deep pitch of the Roar is quite similar to the pitch of the Agg B. It has occurred to me that the Agg B may be intermediate, in some sense, between Roars and "Ord B."

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I do not think that I have heard the adult ♂ Red utter any Roars. Certainly none of the young Reds have.

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   All the Blacks utter Trills now; but they have been very rare until yesterday; when we let all the little Reds loose and there was a good deal of excitement in the whole group. Some of the new young Reds tried to

Transcription Notes:
Smithsonian: every use of NYB is a best guess on transcriber's part. Previous page transcribes same as MfB