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92

Atlapetes, Sept. 30, 1962, II  

the birds, but they can't be far apart. Associating with one another?
  
Finally get decent view of PR. Back and wings are slate colored. Not too very much lighter than facial mask. Front of crown is more orange yellow than underparts, but not rufous. Yellow underneath marked with dusky on flanks.
  
This bird in mixed flock. Possibly serving as leader. With White-bearded Flycatcher,(?) Myrobones (?) possibly others.
  
This bird apparently joined by mate after a minute or so. Song as "greeting." Delivered from unritualized posture, without CR.
  
To my knowledge, I haven't heard the local PL's utter the very loud "greeting" patterns which were so common, at times, near Merida. Is the local form intermediate between Mérida form and the Quito leucopterus in gregarious behavior?
  
Speak of the devil! Now, 6:36. Hear burst of what sounds like PL "Warble", followed immediately by "Feeoo" notes. No R. Can't see bird(s).
  
Still, these birds are certainly quieter, on the whole, than the Mérida ones.
  
The PR Atlapetes seem to be stimulated by the sound of D. lafresnayei singing. Why?Why is it advantageous?
  
Later in the morning, still in same area, come across two mixed flocks or, more probably, the same mixed flock twice. Including pair of PR's but no PL's. Almost certainly the same birds as in mixed flock yesterday. I am now beginning to think that PR's may play a definite, special, social role in their mixed flocks. SEE TODAY'S NOTES ON MIXED FLOCKS.