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[[underlined]]Cyanerpes[[/underlined]], I         57[[circled]]
March 7, 1958
Barro Colorado
Well! I finally managed to catch a [[male symbol]] Shining in the net this morning. Banded white left.
The initial response by the [[female symbol]] when he was let loose in the aviary was flying to him with a burst.
This [[male symbol]] several times gave the same Bzz & St performance both before being caught and after being let loose.  Adopted an St much like the one drawn on Mar. 1, p. 55, with pronounced BL and belly-fluffing - but with wings meeting over the lower back. Each time he did this - and he must have done it at least 4 times - he gave a few Bzz notes.  They seemed to be an integral essential part of the performance.
This would certainly suggest very strongly that the Bzz's are homologous with the Wh N's of the Blues - a conclusion which rather surprises me, I think, but seems quite plausible.
There was also a small dispute between the 2 fully adult captive [[male symbol]]] Blues. The aggressor just advanced down a twig toward his opponent, in a  more or less unritualized posture with jabbing int. movs.
The less aggressive bird, however, [[underlined]]stood in extremely high, stretched up St[[/underlined]] (like that of some [[female symbol]]'s I have seen at times) [[underlined]]with extreme CR[[/underlined]] and a relatively little fluffing of the heart & belly feathers.  He would stand in this extreme posture for a second or two, retract a fraction of an inch, stand in the same posture, again, etc.  Finally flew off.  Both birds seemed to be quite silent throughout. This incident would certainly suggest that the high St and CR cannot be very aggressive.
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