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9

Rhamphocelus, Feb. 24, 1958, II                

at times. I think that the [[female symbol]] stopped calling after the first second or so of the dispute; but continued keeping bill open (at least in the intervals of pecks at the [[male symbol]] - although some pecks were also accompanied by wide open bill) in a form of G.

I should mention that this white right [[male symbol]] uttered several notes which appeared to be H Ser's when I handled him in the nest. Sounded much like all the other notes of the species, i.e. hoarse and nasal, but longer & louder.

It is remarkable, in fact, how all the calls of this species sound so remarkably similar. Difficult to decide exactly how many distinct calls should be recognized. I am by no means sure that I have made the proper distinctions yet.

Again, another brief dispute during feeding. This time the [[female symbol]] just uttered a single WhN as she turned to face the [[male  symbol]] (the old one), and he immediately retreated. Threat?
  

Rhamphocelus, I            

February 27, 1958
Barro Colorado

A long fight between the 2 [[male symbol]]s in the aviary this morning. The right red [[male symbol]] just gaped (apparently silent), with head feathers raised as in the drawing on Jan. 30, p. 5. Head rather withdrawn too, as in the same drawing, but body & tail more or less horizontal. The white right [[male symbol]] uttered Wh Notes!!! Just like the notes the other [[male  symbol]] had uttered when the [[female symbol]] was first introduced, but without any St. Posture.

I later heard several other bursts of Wh Notes in apparently purely hostile circumstances.