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68

Atlapetes, Apr. 16, 1962, II.

very closely related to Chlorospingus.

These patterns are probably perfectly intermediate between the HAC patterns of tanagers and the thin "eeeeeeee" type hostile notes of Emberiza spp. described by Andrew.

In the midst of this whole performance, one of the young birds uttered a single, rather weak, "Tuck" note. The only note of this type uttered. Not accompanied by special postures or movements.

The birds fell absolutely silent, very abruptly, as soon as they got out of sight of me (when they flew over a dense "hedge" of tangled vegetation about 20 ft away from me).

This incident is another indication that escape is as strong as, or stronger than, attack when ECN's are uttered.


Atlapetes, I
April 18, 1962
Cerro Punta

Working at Lewis's place this afternoon.

3:40 p.m. Suddenly come across what seems to be a boundary dispute between Yellow-throats. 2 or 3 birds. Uttering lots and lots of ECN's. Nearly continuous. Notes might be transcribed as "Zeeeeeeee" or "Wheeeeeeee". Only slightly buzzy. Also quite a lot of short sharp notes, almost exactly intermediate between "Tsit" and "Tuck". These SHN's sometimes single. More often in brief series, 3 (possibly 4) notes at a time. These brief series so accelerated as to form real brief R's. Reminiscent of R's of Piranga in sound.

I think the R's were usually or always given by birds hopping from perch to perch;  but possibly also by birds which were momentarily stationary. The birds also did a good deal of Bowing during this