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Mixed Diglossini, May 19, 1965, V. (54) [[Image - drawing of bird with wings spread and tail raised]] Bill closed or opened only very slightly. ^[[Ater]] At least once (and probably several times) one of the birds (the pursued, I think goes into TV Posture, with wings spread to at least a considerable extent. Breast lowered, so that rear of body, as well as tail points upward. No trace BU. Belly feathers probably fluffed, but probably not extremely. I think that the bird uttered R in TV. [[underlined]] Wings certainly Q'd, [[/underlined]] slightly but rapidly, in TV. I couldn't tell if this was done on "purpose, or was simply the "shaking" produced by the R. All this occurred in [[underlined]] very [[/underlined]] low and [[underlined]] scattered [[/underlined]] scrub (the sort of thing that grows up in pastures after only a couple of years). Then one of the birds disappeared. The other flew to a bush. Perched 2-3 ft up and Sang repeatedly. Songs perfectly typical. No R component. ^[[Ater CC]] ^[[XXXIII 140]] ^[[187 194]] ^[[CC]] Then the Singing bird shut ^[[checkmark]] up. Flew to join mixed flock. At the time of joining flock included 3 ^[[three checkmarks]] [[underlined]] rufinuchas, [[/underlined]] 2 ^[[two checkmarks]] CC's, 1 ^[[checkmark]] [[underlined]] cyanocephala [[/underlined]] 1 ^[[checkmark]] Yellow-faced Whitestart, and 1 Andean Sparrow. Moving downhill, thru same region of low scattered scrub. All birds very quiet. Sparrow on ground. Others ranging 1-5 ft up. Ater apparently stays with flock for only a few seconds, then disappears. Sparrow also disappears soon. Then [[underlined]] cyanocephala [[/underlined]] flies away. Definitely not followed by anybody. Rest of flock continues moving downhill. For a time, at least, CC's definitely in lead. [[underlined]] rufinuchas [[/underlined]] repeatedly follow CC's. But they do so at a distance. Often 20-30 ft behind CC's. Whitestart repeatedly follows and joins [[underlined]] rufinuchas [[/underlined]]. (The detached course it followed showed that it was much more strongly attracted to the [[underlined]] rufinuchas [[/underlined]] than to the CC's. Not surprising, in view of the color schemes of the species!)