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Cyanerpes, Dec. 14, 1957, IV 23

this encounter); probably usually appears when the attack and escape drives are approximately in balance. Wh Notes are probably the next highest intensity pattern; probably also produced when a. & e. are in approximate balance ―with attack probably slightly predominant. G is apparently less aggressive than the Wh Notes. The St's never appear at quite such low intensities as some of the G's and Wh. The other "Wh complex" patterns; e.g. BF, are higher intensity still.
It should be noted that the ♂ of the established pair tolerates the approach of the newcomers rather better than does the ♀. It is possible that the newcomers tend to approach the ♂ of the pair more than they do the ♀. Anyhow, the net effect is that the 3 ♂'s are sometimes more or less close together; while the ♀ is a little set apart. This may be significant ―especially when it is remembered that ♂'s are more common "visitors" than ♀'s. It may be that the ♂'s of this species are more gregarious than the ♀'s.
Both the intruding ♂'s sometimes gave Wh Notes (usually in doublets "Wheeeoo Whoo") when flying away from an advance or attack by one of the pair birds. These Wh Notes seem to be louder; and perhaps slightly harsher, than some of the Wh Notes between the old established ♂ and ♀; but there seem to be all sorts of intermediates between the 2 types.
Later, several hours after being introduced into the cage, the older of the 2 newcomers is making lots of vigorous short flights around the cage, with lots of slightly harsh CN's (possibly intermediate between CN and HCN's). Escape behavior? Little CR between flights