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[[circled]] 74 [[/circled]]
onating with flock. [[underline]] This apparently is one of the areas where B. nigrocristatus is commensal! [[/underline]]
Then get better view of flock as a whole. Now includes at least 2 White-beards, at least 2 Ruddies, 2 Yellow-bellies, 1 [[check mark]] [[underline]] Cnemoscopus [[/underline]], a variety of tree creepers [[three check marks]] and furnariids, at least 4 [[four check marks]] wrens (all same species), a variety [[three check marks]] of humming birds, [[underline]] at least 2 [[two check marks]] of the Maroon-crested Montane Cotingas!!! (to my knowledge, this is the only place I have seen this species in mixed flocks) [[/underline]], and at least 
[[margin, in red]] Sitti [[/margin]]
one Sitti [[check mark]], in addition to the [[underline]] nigrocristatus [[/underline]]. Yellow-bellies f -------> groups at least twice. [[underline]] B. nigrocristatus [[/underline]] f -------> Sitti f -----> group at least three times. I can't tell who is (or are) the leader(s). The [[underline]] B. nigrocristatus [[/underline]] stay in scrub, 1 - 3 ft up. The Yellow-bellies vary from low scrub, 1 ft up, to tall trees, 25 ft up. All other species stay in trees, 15 - 30 ft up. Sitti, at least, is feeding by picking insects off leaves. Group as a whole fairly quiet. Lots of "CN"s, but little or nothing else. 
Group eventually turns and starts down hill. At least at this stage, it is fairly coherent. Birds 10 - 30 ft apart. More coherent than any other flock seen here today.
NOTE: The reason I am fairly certain that all or most of the more diffuse groups seen here today were definite social units is that we also have passed thru large stretches of suitable looking forest and edge in which birds seemed to be completely absent.
3:40 pm 10,000 ft See pair of the big [[underline]] Butteraupes [[/underline]]  ([[underline]]montana [[/underline]] or [[underline]] cucullate [[/underline]] or whatever it is). In second growth trees in midst mature forest. Silent and alone. Fly away immediately. Catch up with same birds a few minutes later. Now see that