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[[circled]]2[[/circled]]

while the PL Altapetes is definitely a follower (in much the same way as the Yellow-[[?thighs]] in Chiriqui).

Tree flocks include Black and White Warblers and other wintering N. American warblers, [[underlined]]Thraupis cyanocephala[[/underlined]], various Tangara-like tanagers (at lower altitudes), Slate-throated and White-spectacled Redstarts (the White-spectacled may be a bird of relatively high altitudes, just like the  Collared in Chiriqui), as well as various furnarids and hummingbirds (presumably not always the same species as with [[?thicket]] flocks).

This is the type of flock most often joined by [[underlined]]cyanea.[[/underlined]]

I don't know who are the followers and who are the leaders in this type of flock.

I also don't know if the two types of flocks coalesce regularly or not.

The role of BCBT's may be significant in this connection.  They seem to be primarily tree flock birds, but they may come relatively low more frequently than most of the other members of the tree flocks.  But it still remains to be proved that the local BCBT's are nuclear (or even regular members of mixed flocks)!!!

September 21, 1962
Paramo La Negra

See an interesting flock this morning.  7:00 AM.  9350 ft.  In alpine scrub, just below paramo itself.  Nucleus composed of 3 PL Altapetes 1 Yellow-belly [[underlined]] Poculotheranpis [[/underlined]], who stayed together as long as I watched the flock (at least 5 mins.) This