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124
Ramphocelus,  Mar. 17, 1962, III    

This was obviously a case of a male being attracted by apparent pre-cop behavior of another male.
  
The fact that the first male did not immediately attack the second male may be a reflection of the relatively extreme gregariousness of this species!!!
  
Spreading of tail might be an indication of cop. motivation (I don't know if the males in extreme Low Postures during the dispute I watched a week or so ago had their tails spread in this way). The TU was probably also an indication of cop. motivation.
  
(I don't think the females I have seen in BU-TU had their tails spread. At least not as much as this male. Is this a sexual difference?
  
6:20 p.m. Walking around this evening I have heard several male Yellow-rumps utter single "Tseeeyah" or "Keeyah" notes, or series of such notes. Such notes are wiry, and seem to be Ф's without the ФR. Or intermediate between typical  TssN's and typical Ф's with ФR. I am not sure how such notes differ from hoarse buzzy PN's. (Probably shorter?)

Ramphocelus, I      
March 18, 1962
Rio Piedras

Arrive area where the incidents between 2 males and 1 female occurred yesterday 6:00 a.m.
  
See first Yellow-rump flying about 6:13; but all birds still silent. NN's begin a few seconds later.
  
One male flies into tree 6:20. Uttering series single Ф's without ФR. Then alternates single Ф's without ФR with single DC or soft PN's

Transcription Notes:
Ф phi