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As far as my observations go-there is positive correlation between mixed flocks (both the presence of such flocks, and their "richness" or complexity) and density of vegetation (and, therefore, humidity - more or less). But I don't think that this works in the northern Andes - or, at least, doesn't work as well. Surely the Bogata' and Merida regions do not have mush more dense vegetation than Palea (Peru) or the point of Macchu Picchu in which mixed flocks are absent???

March 11, 1964
Below Unduavi

Arrive 6:18. Just getting light. Weather quite good.Almost nothing in the way of a Dawn Chorus.

[[margin in red]] Brun [[/margin]]
6:25. A few (mostly unidentified) things begin to sing. Also thrush alarm calls. Some Andean Sparrow song. Hear first probale Brun song (fast even rattle like, twitter) 6:10 First Whitestart song a second later. No overlapping Whitestart continues while Brun remains silent. Whitestart shuts up. Brun utters one phrase.

See "mixed flock" of Cys and Brun. SEE TODAY'S NOTES ON MIXED DIGLOSSINI.

Bruns quite silent now, 7:07. Whitestart still singing furiously

See a single thrush alone. Brownish

See a single Whitestart alone.

The sun is out and it is beautifully clear now.

7:40. See a pair of [[underlined]]rufunucha[[/underlined]]^[[2 check marks above]]alone. In low second growth scrub. Alone.

7:54. See a pair of [[underlined]] cyanocephala [[/underlined]]^[[2 check marks above]] alone. In low trees where Cys and Brun were seen earlier this morning. the tanagers eventually fly away. Just after