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Atlapetes, Jun. 2, 1960, III.     (36)

produced by thwarting of some pairing and/or sexual drive(s). It is probably significant that both birds I saw just before they began uttering "Soo-eeeeeee" Notes, or in the intervals, between notes, were apparently single.
  
The Yellow-bellies were singing even more intensively this morning. Quite commonly until well after 7:30 a.m. The usual variety of songs for the birds of this area. Still without rattles. The length of time the birds sing here would suggest that they are more advanced in the breeding cycle than the birds we heard on Cerro Atacaso. Perhaps the absence of the presumably hostile rattles at the end of songs is merely an indication of a relatively advanced stage of the cycle?
  
I heard lots more CN's and "greetings," like we heard before, uttered by quite a number of birds this morning. Most frequently uttered by some birds which appeared to be moving about in a party of 4, perhaps a family party. It is my impression that both the CN's and the typical "greeting" sounds are usually most common in such parties.
  
Twice I heard one bird utter some more distinctive sounds apparently as "greeting" when it joined its mate. This peculiar "greeting" was a real "warble," a very rapid "Tit-it-it-it-zeeaa-zeeaa-zeeaa-zeeaa." Perhaps a peculiar combination of ordinary CN's and typical "greeting" notes???
  
The bill of this species is really quite large and thick - for an Atlapetes.
  
I noticed this morning that the feathers of the crown are really conspicuously separated during CR's.
  
This afternoon I heard what was apparently a Black-headed Atlapetes begin to sing around 4:30 p.m. Mostly "Soo-eeeeee" Notes, intermingled with an occasional "Seeeeeee." Listening close up, it was apparent
  

Transcription Notes:
Changed "foo-eeeee" to "Soo-eeeee" Left Margins: 1st and last paragraphs 2 vertical and 1 vertical hatched lines in brown; 2nd, 3rd & 4th paragraphs 2 vertical & 1 vertical hatched lines in red; 5th & 6th paragraphs red S-like squiggle.