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Lots of TW's and some twitter. Most of the noise contributed by the [[underline]] bonariensis [[/underline]], but the [[underline]] cyanocephala [[/underline]] may have added a little. Group as a whole is quite difficult to follow. Keeps appearing and disappearing from right in scrub ^[[margin, red]] Brun [[/margin, red]] 1 Brun flies toward the group, lands in scrub about 15 – 20 ft away; but does not, I think, come much closer (i.e. this Brun may have been trying to "escort" the group out of its territory). About this time, the [[underline]] cyanocephala [[/underline]] seems to disappear. Then, during one of the periods in which the group (now possibly only [[underline]] bonariensis [[/underline]]) is not visible, I catch a brief glimpse of a single bird which may be [[underline]] A. rufinucha [[/underline]] flitting thru scrub in exact place where the [[underline]] bonariensis [[/underline]] were earlier and where they reappeared a few seconds later. [[margin, red]] CC Brun [[/margin, red]] When they reappeared, there was no sign of a [[underline]] rufinucha [[/underline]] with them. Then, a few seconds later, see a single CC and a single Brun quite close to one another and quite close to 1 bright and 1 dull [[underline]] bonariensis [[/underline]]. The Brun flies off. Then the CC does. Then the 2 [[underline]] bonariensis [[/underline]] also leave. This is the last I see of either the group or the [[underline]] bonariensis [[/underline]].

A few seconds later see a single [[underline]] cyanocephala [[/underline]] in area where flock was earlier. Apparently alone now. Silent. Flies away.

[[margin, red]] Brun [[/margin, red]] A minute or so later a single Brun (re-)appears in same area. Sings briefly. Disappears.

ADDITION: There were several apparently hostile pursuits among the [[underline]] bonariensis [[/underline]] in the mixed flock. I shouldn't be surprised if there were 2 family groups involved.

If so, it may help to explain why the mixed flock was formed. The noise and activity involved in the intra-specific dispute may be the reason why the group of[[underline]] bonariensis [[/underline]] was attractive to individuals of other species. (This might be an indication that individuals who do not usually join other species retain the capacity to do so.)