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Atlapetes, May 31, 1960, II.     (33)

always alone, or in pairs, or what appear to be family groups.
   
Early this morning, in exactly the same area where we have heard a [[male symbol]] Yellow-belly sing [[image 1]] type song on previous days, we heard the same type of song again. Obviously the same [[male symbol]], sticking to the same type of song for (at least) an appreciable period

Atlapetes, I 
    
June 1, 1960
Cerro Pichincha
 
Working near Nono again today.
   
Watched one Yellow-belly in particular. Sang early this morning and then again at 4:30 p.m. this afternoon. Most of his songs were more or less like the ones we have heard other birds utter before (none of them included any terminal rattle); but a few of his song phrases were slightly peculiar. A complete phrase of this peculiar type might be represented as follows:

[[image 2]] Toooeee  Teeeooo cha-cha-cha-cha-cha-cha-cha]]

(The number of "cha" notes at the end was quite variable — sometimes only one or two.) The bird sat in the usual singing posture while uttering this type of song.  Always apparently alone.
  
All or almost all the Yellow-bellies we have seen singing this trip have been apparently alone. This would definitely indicate that the song of this species (at least the [[image 3]] part, without the rattle) is usually or always produced by thwarting of some pairing and/or sexual drive.
                                  

Transcription Notes:
[[image 1: sketch of male yellow-belly song structure]] [[image 2: There are lines above tooocee and toeecooo and cha-cha-cha]] [[image: sketch of song structure]]