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[[circled]] 4 [[/circled]]
is possible to say that the BYB was in [[underlined]] front [[/underlined]] of the Slate-throats.
But, I [[underlined]] think [[/underlined]] that the BYB had just "come in", i.e. just flown to
this position from some distance further away Thus, it may have joined the Slate-throats. In any case, it just not where it was until the Slate-throats caught up with it. Then it flew away [[underlined]] with [[/underlined]] the Slate-throats. I couldn't determine who was following whom.

The Sooty Thrushes seen today must all have been [[underlined]] fuscater [[/underlined]], I think. 
Definitely brownish-sooty [[underlined]] not [[/underlined]] black. My best view was of the birds with the last mixed flock. Definitely with orange coral bill and legs. One individual seemed to have a dark eye-ring; the other seemed to have a yellow-orange eye-ring. Chin dark, light the body. Definitely not at all light. Abdomen and vent region also apparently dark. 

If it is really characteristic of this region that [[underlined]]Turdus Fuscater[[/underlined]] and [[underlined]]Myioborus miniatus[[/underlined]] are regular members of mixed flocks, then it probably would be correct to say that mixed flocks reach their "highest development"in this region.

If so, it rather confirms my current general hypothesis. I.E. the development of mixed flocks in any given region is positively correlated with the frequency with which the region is (or has been) invaded from other regions. 
ADDITION: The Slate-throats in the Slate-throat - BYB - "Glauc" - Sooty Thrush flock were seen to range from 10 to 30 ft above ground. [[margin, in red]] Albi [[/margin]] The "Glauc" was seen to range from approximately 10 - 20 ft above ground. The Sooty Thrushes appreared to have much the same range as the Slate-throats. The BYB was