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17

Rhamphocelus, Mar. 18, 1958, II            

the usual MCN-G-C patterns in the midst of this "Hullabulloo."

None of the birds during this dispute gave many of the "Wheet" Notes(which I shall call "Plaintive Call Notes, PCN). In fact, I am not sure that any PCN's were ever uttered during the encounter. As I am fairly certain that the encounter was very hostile, this would suggest that the PCN cannot be primarily hostile.

One of the Sangre de Toros landed beside the Yellow-rump during this dispute, and the Yellow-rump immediately R-d at it. I got a very good view of the R this time. No trace of ritualized postures or movements. Bill opened wide during the R, and kept open throughout (the mandibles perhaps vibrating very slightly), while the bird just sat in its ordinary sitting posture.


Rhamphocelus, I  
        
March 20, 1958
K-6

There are quite a lot of Sangre de Toros around here, at least 3 pairs. Quite mobile, sometimes all of them around in the neighborhood, sometimes none at all within hearing.

As previously mentioned, all these birds utter lots and lots of CN's as they move around at times, this seems rather like "friendly song," a means of calling in the mate, i.e. one bird of a pair will utter "CN's when it becomes separated from its mate. But this appearance is probably partially deceptive.

Transcription Notes:
Author writes as: Rhamphocelus