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[[Circled]] 37 [[/circled]]
[[underline]] Aletes [[/underline]] ssp, Oct 29, 1960., IV.

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 directed toward me. But Abdomeno never uttered many Trills, even at his tamest.  This would appear to be very significant.   Abdomeno probably didn't utter many Trills because he was independent by the time we got him.  

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In the case of the Blacks, it is fairly evident that the Trills begin as a frustration pattern, probably largely or completely a lost call, in young infants, and then became [[underlined]] largely or completely [[/underlined]] hostile in adults (see notes below).

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The development of Trills is probably the same in Reds. If so, Abdomeno's behavior would indicate that once an infant becomes more or less independent, it stops giving Trills frequently. 

All the young Reds utter screams when picked up.  Sometimes very harsh, sometimes higher and thinner. I think that the higher and thinner types contain a stronger escape component.

The infants and young juvenile Reds have not uttered any B Notes Even when they fight among themselves, they utter screams rather than B. The B patterns must be considered essentially adult. It is possible, however, that young Reds are capable of uttering some B, like the S young Black described above. It is possible that my young Reds have not uttered B because the circumstances have not been right. B may be suppressed by fear, and all my very young Reds except Abdomeno have been shy. And I never teased or irritated Abdomeno in a way which might be expected to provoke B.

There are indicators that B patterns first appear, or first begin to become "regular" when the animals are about 1/2 grown, (when they are "older juveniles" in my terminology). See notes on captive [[female symbol]] Red on June 24, 1959, p. 24, above. And today my 2 oldest juvenile Reds, both [[female symbol]]'s, are a little less than 1/2 grown and the other a little more, engaged in "playful" wrestling, just like that of adult Blacks (see below). With MO, and MfB by one or (more probably) both animals. Their MfB's were quite like those of adults in sound, but definitely much weaker.