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[[circled]] 43 [[/circled]] leaves, probing in bark, etc. etc. Only one exception observed. One Cy probed into small cluster tubular red [[margin, in red]] Cy [[/margin]] flowers in tree, apparently getting nectar, for some seconds. Flock as a whole very noisy. Difficult to tell who was leading the flock as a whole. The tree and scrub groups or sub-groups advancing parallel. I couldn't tell if one sub-group was ahead of the other or not. The [[underline]] H. superciliaris – B. luteoviridis [[/underline]] types certainly were the leaders of the scrub sub-group. The Whitestarts, [[underline]] rufinucha [[/underline]], and [[underline]] H. atro-pileus [[/underline]] followed repeatedly. Leadership within the tree [[margin, in red]] Sitti [[/margin]] sub-group seemed to be much less constant. The Sittis appeared to lead more frequently than anyone else. Perhaps the "particolored" plumage of the Sittis is an adaptation to [[margin, in red]] Sitti [[/margin]] leading flocks (at least when no other natural leaders are present)??? [[margin, in red]] Sitti WCC [[/margin]] There certainly were [[underline]] no [[/underline]] WCC's in this group. I think that this is the first time I have ever seen the Sittis here when WCC's were not also present. The Cys showed no tendency to associate particularly closely with the Sittis. [[margin, in red]] Cy [[/margin]] Sometimes followed Sittis, but at a distance – and when there were other birds between. The Cys may have shown a tendency to associate with the Yellow-belly (both with blue). The Western Tanager and the Yellow-belly also may have shown a tendency to stick together (both with yellow!). After some minutes, the two sub-groups, the tree and the scrub, [[underline]] split up [[/underline]] and went in different directions! [[image: two-headed arrow]] Both disappear from sight. COMMENT: Altho it is often possible to recognize distinct tree and scrub flocks here, they are not as well segregated as in some other parts of the Andes. There are a number of species (e.g. the Yellow-belly and the Yellow-fa