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[[right justified]] [[cirled]] 96 [[/circled]] [[/justified]] 

and White Hummingbird. All 15 - 25 ft up in trees.

As soon as this third flock appears, the Yellow faces of the second flock turn around and go [[underlined]] rapidly [[/underlined]] down hill again. This, in spite of the fact that there do [[underlined]] not [[/underlined]] seem to be any (other) Yellow faces with the third group. The Yellow faces apparently are followed by some or all of the Yellow bellies.

On their way down hill, the Yellow faces pass thru or over the clump of bushes in which the [[underlined]] B. nigrocristatus [[/underlined]] have remained. This time, as soon as the Yellow faces have passed, the [[underlined]] nigrocristatus follow them [[/underlined]] (or them & the Yellow bellies) [[underlined]] at least part of the way down hill [[/underlined]]!!!!
[[margin, in green]] 98 [[/margin]]

A few minutes later, same area, I see a single Cy [[green checkcmark]] going uphill,

[[margin, in red]] Cy [[/margin]]

thru scrub, apparently on its way to join the arboreal third flock.

This is as nice a case of an encounter between apparently distinct flocks as I have ever seen. 

But there are complications! It is quite possible, for example, that the Red Woodpecker which apparently started out with the second flock eventually joined the third. [[underlined]] Also, the area where the third flock appeared is between the areas of the first and second flocks, which themselves are not far apart. [[/underlined]]

In actual fact, there seems to be a nearly continuous mass of birds throughout this whole "series" of areas. I have not yet, this morning, come to any large "uninhabited gaps" such as separate flock ranges in most parts of the Andes. Thus, in view of the fact that some of the "groups" seen have been diffuse, one might suppose that they are purely "accidental" associations. But I think that detailed observation of the exact movements of particular individuals is sufficient to reveal that at least some of the groups are "organized" social entities