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[[underlined]]Cyanerpes[[/underlined]], Mar. 29, 1961, IV,        90[[circled]]
(in the way of hostile displays). This is presumably even lower intensity than Black Fluff -CR.
Quite a lot of single HCN's are uttered in these flocks. But I have not been able to determine who utters them. I rather think that all or most of these HCN's are usually uttered by the [[female symbol]]'s.
The [[female symbol]]'s (also) assume a lot of CR's, without uttering and sounds, in theses flocks. No other ritualized hostile movement and/or postures.
HCN's are the only sound I have heard in these flocks.
At one time, I thought that all their flitting, etc., flocks might be some form of communal display. But I rather doubt it now. I think that these flocks are just the result if the inter-species gregariousness of the species still expressing itself in the breeding season. The hostility is presumably the inevitable result of the birds coming together at this season. The behavior of Blue Honeycreepers in these flocks may be strictly comparable to the behavior of the plain-colored Tanagers in the flock I watched yesterday (see today's notes on [[underlined]]Tangara[[/underlined]]).
It may be significant that these flocks of Blue Honeycreepers are found most frequently and maintained for the longest periods of time in the afternoons. Sexual relations are probably relatively rare in the afternoons.
All the [[male symbol]] Blue Honeycreepers seem to be in complete nuptial plumage now. They are probably all also mated (although they sometimes become separated from their mates). I have never seen a [[female symbol]]apart from a [[male symbol]] during the last few weeks. As far as I can tell none of the females are incubating yet. And there certainly don't seem to be any young around.
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