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151

Ramphocelus, May 5, 1962, III     

It is my impression that this species utters more intermediate vocal patterns, intermediates between very different patterns, than any related species I have studied.
 
Ramphocelus, I              

November 1, 1962
Barro Colorado

3:25 p.m. See a single male Yellow-rump, perched in bush behind my house, 10-15 ft above ground, uttering "subsong" ("SS"). Quite alone.

This bird was in complete adult plumage. In area where adult pair was frequently seen last Spring and Summer. But unfortunately I couldn't see if it was banded or not.

SS itself was soft, but by no means inaudible. Quite variable in form. Moderately long phrases (possibly somewhat "determinate" in length — at least to some extent. Including a great variety of notes. Soft "Wheeeooo"s, "Zeee-zee"s, "Chuck"s, and "Chuh-hucks". "Wheeeooo"s probably most common. Usually first note in each phrase.

All the time the bird sang this SS, it sat in more or less erect posture, with wings-drooped, and slight Back R.

Once the bird interrupted SS to utter Φ's (with R). Probably when it saw me