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[[circle]] 97 [[/circle]]

(viz the Yellowface-Yellowbelly and Yellowface - [[underlined]] nigrocristatus [[/underlined]] associations described above). There are, at least, "nodes" in the "matrix".

COMMENT: Mixed flocks may be closer together here than anywhere else I have ever worked (with the possible exception of the low woods near the Finca below Munchique). This would suggest that the (comparative) rarity of mixed flocks nearer Medellin is due to the fact that most of the natural vegetation near there has been destroyed. Certainly, to my eyes, there is more natural-looking vegetation around here than anywhere else in the region.

This, in turn, would support my hypothesis that accesibility to "island hopping" largely determines the frequency with which mixed flocks occur in any given region. This part of the Central Cordillera may be [[underlined]] particularly accessible [[/underlined]], simply because is is itself divided into several "islands" and also is particularly close to two "islands" (Frontero and Paramillo) of the Western Cordillera.

Mixed flocks certainly seem to be more common, and larger, here than in Moscopan, at comparable altitudes (and probably humidity) in the southern part of the Central Cordillera, last May.

Same area, 9:20 am. From sounds, I can tell that the Yellowfaces, Yellowbellies, and [[underlined]] B. nigrocristatus [[/underlined] are still around. But not very close together now.

Third flock disappeared a long time ago. It certainly appeared to be very coherent and making rapid progress in a definite direction.

Going back down road 9:30 am.

Reach area where first flock seen 9:35. All birds have gone! Area quite silent and deserted! This is good evidence that the first flock really was a social group, not just an accidental association in a particu

Transcription Notes:
first unknown word--could not figure it out on the previous page either. There is a Anairetes nigrocristatus but this doesn't seem to be the word.