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19

Ramphocelus, I 
                             
April 6, 1958
Barro Colorado

I am sure that the captive "female" Sangre de Toro was "singing" again this morning. Couldn't see the bird well, but the sound of the song was remarkably like the WS's of the young male Blue Honeycreepers.

And this "female" did utter a peculiar double note, a very soft, but clear & pleasant (not nasal or harsh) "Whee hooo" between WS phrases. This appeared to be a form of "call note," (it actually sounded like the CN's of some other species. but it is also, I think, one of the musical notes incorporated in the WS itself.


Ramphocelus, I  
      
April 22, 1958
Barro Colorado

The black left "female" Sangre de Toro has sung quite a lot yesterday and this morning. Quite definite. Sitting in an unritualized posture. Notes so soft that they are difficult to describe, but I think that the whole phrase is really very little varied.  Yesterday the songs were interspersed with MCN's and, particularly CN's (both before and after the songs). But it is probably significant that, today, when a strange male was visiting, and both the captive birds were (?) about excitedly, uttering a lot of CN's and MCN's, the black left bird did not (underlined) sing at all as long as the great excitement lasted. I.e. this WS cannot be purely, or even largely, hostile.