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Cyanerpes, Dec. 14, 1957, II. 21

Most of the reaction; of course, was by the pair which has been in the aviary a long time. Lots of CR; the ♂ doing it in a rather low, obviously unritualized, ordinary sitting posture, the ♀ doing it in a much more erect posture, which I shall call the Upright (U). Some flying about by almost all birds; but not too much All the CN patterns surprisingly rare. A few ordinary CN's, but no HCN's! A lot of Wh Notes by both the ♂ and ♀ of the established pair, whenever one of the newcomers sat or flew too near some of this from completely unritualized postures. Others with St. (and often with CR). When a marked St developed, it was usually combined with an apparently ritualized body posture ―which was different in the 2 sexes. The ♂ went into a more or less low intensity version of the posture drawn on page 6 (Nov 30, VI.) Definite BF, and body more or less horizontal, tail perhaps slightly higher than breast. I shall call this posture of the body L. There was no trace of Wfl during any of these encounters. The "St" posture accompanying some of the ♀'s Wh Notes was rather different. Much higher posture, inclined more forward, which I shall call HSt. Quite like the posture with G drawn on page 7 (Dec 1, II.)
   
[[image]] ♀ UaCR
(wings sometimes out of feathers). Slight fluffing of lower belly feathers. Whole body & neck sometimes inclined (diagonally) further forward)

Both ♂ and ♀ of the established pair attacked the intruders