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Atlapetes, Mar. 20, 1960, II.

alone for a comparatively long period, uttered a few single noticeably longer "Tseeeeet" Notes intermingled with ordinary CN's, before flying off, presumably to join its mate.  These long "Tseeeeeet" Notes were presumably produced by thwarting of something like a pairing drive.  I shall call them "ECN's."  I think that once, when one bird was left alone possibly the [[male symbol]]?), it uttered a few CN's and then a long thing, soft, warbling "song", rather like a muffled & particularly soft version of the "song" of the Yellow-thighed Finch.

Both the CN's and the ECN's are certainly usually uttered with the bill closed, although the bill is opened & closed occasionally with either one or both types of notes.  If one bird did utter a "song" today, this was also done with the bill closed throughout.


Atlapetes, I.

March 22, 1960
Cerro Punta

Saw an apparent pair of Yellow-throats sitting exposed on a top of a bush.  A third bird appeared, and one of the pair flew at it and chased it away.  This appeared to be purely hostile.  And apparently purely silent!  The two birds involved in this chase disappeared;  and the remaining bird (the [[female symbol]] of the pair?) remained sitting for several seconds and uttered a while series of ECN's (single but quite rapidly repeated).

This afternoon we saw a little more ECN behavior, in 2 pairs.

In the case of one pair, one bird flew across the road and into a thicket on one side of a field;  and then began to utter ENC's in moderately rapid rhythm – – – – – –