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Atlapetes, Mar. 23, 1960, I.

territories adjoining that of pair B; (we know there is at least one other bird who occasionally meets pair B).

The B's are probably in fairly advanced breeding condition. Twice we have seen one of the B birds carrying n.m.

Every time we flush the B birds, one or both flies away uttering ECN's. I am now fairly certain that the ECN's of this species are generalized frustration reactions - presumably of at least moderate intensity - rather than always the result of thwarted pairing or sexual motivation. At least some ECN's seem to be rather high intensity alarm reactions. One bird I disturbed today stayed in a thicket a few feet from me, hopping about very excitedly (but keeping facing me almost all the time), performing lots of TF's (and WF's), with CR (and probably some slight Thf), and uttered lots & lots of typical ECN's, one right after the other in fairly rapid succession. The bill opened & closed with each ECN (revealing the rose-red inside the mouth quite conspicuously). Eventually this alarmed bird flew away to join its mate - without performing anything else in the way of display.

Several other times, when we disturbed pair B and/or their neighbors, in deep thickets where they were impossible to see adequately, the disturbed birds responded by uttering lots of ECN's and - almost certainly - uttering a series of "song" phrases. These were quite variable; but some of them might be transcribed by something like:  "Tsee Tsee Tseewheehoo" or
"Tsee Tsee Tseehoo" or
"Tsee Tsee Tsee Tsee Wheehoo"

We never actually saw a Yellow-throat utter such song phrases, 

Transcription Notes:
While all is transcribed correctly, the last "Tsee Tsee Tsee Tsee Wheehoo" is underlined in a manner indicating the pitch of the notes.