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[[circled]] 6 [[/circled]] Tangara, Dec. 15, 1957, I [[Left margin]] [[3 blue vertical lines; 1 blue cross-hatched vertical line]] [[/Left margin]] Essentially repeated alternations of CN's (or similar notes) and a perfectly mechanical Trill (Tr) which may have been a form of "song". [[Left margin]] [[3 blue vertical lines; 1 blue cross-hatched vertical line]] [[/Left margin]] The CN - blue notes were uttered in series. Usually a definite interval between notes; but sometimes slightly accelerated. I think that these may have been the same as the CN's I have heard uttered by birds at greater distances; but, at least close up like this, they sounded particularly harsh & loud (but not hoarse or nasal). Uttered from completely unritualized posture, bill opening & closing with each note, some slight TF & WF (both synchronized with the notes and between notes). [[Left margin]] [[3 blue vertical lines; 1 blue cross-hatched vertical line]] [[/Left margin]] The Trs with which these notes were alternated were also given from completely unritualized postures, more or less forward - unchanged, like the postures from which the Thraupis Tanagers give their "Songs." Bill kept open throughout the whole Tr. [[image - drawing of a bird)]] This Tr seemed much less harsh than the preceding CN's. And there was absolutely no intergradation between the 2 vocal performances. They were quite rigidly separated in both rhythm & quality. [[Left margin]] [[3 blue vertical lines showing; 1 blue cross-hatched vertical line]] [[/Left margin]] I can't really say what the cause of these performances was; but I imagine they were more or less hostile; provoked by me or (more probably) the birds in the aviary. [[Left margin]] [[ 3 blue vertical lines; 1 blue cross-hatched vertical line]] [[/Left margin]] The unritualized posture accompanying the Tr may be taken as further evidence of the relationship between Thraupis & Tangara [[Left margin]] [[3 gray vertical lines; 1 gray cross-hatched vertical line]] [[/Left margin] Although, in the normal course of events in a mixed flock, it is usually the Blue and Palm Tanagers who follow the Plains, I have
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No indentations needed. I fixed that.