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Tangara, Mar. 23, 1960, III  

some birds of other species!!! (Brown-capped Bush-tanagers, Wilson's Warblers, and a great variety of other tanagers, warblers, thrushes, and flycatchers). When Brown-caps are absent (as is sometimes the case along the edge of the Llanos), the silver-throats seem to be the noisiest and most conspicuous members of the mixed flocks. They are also about as active as any other member of the mixed flocks. So they seem to be "nuclear" to some extent at least.

It is difficult to determine exactly how many silver-throats there are in most flocks. At least 2, presumably a pair, in all or most cases. Probably 3 or (even more probably?) 4 in the flocks we have been studying the last 2 days along the edge of the Llanos. At least one bird in one flock I saw today was juvenile. So the silver-throats in these flocks may all be single family parties. Possibly always the same family in the flocks along the edge of the Llanos (although I rather doubt it).

I almost forgot - Once this afternoon we thought we saw one speckled feed a berry to the other. Not accompanied by any obvious call or display (although the receiving bird tilted its head & bill upward, in what could have been an int. mov. of an ft. posture, immediately after it appeared to have been fed).

Tangara, I   
 
October 18,1960
Barro Colorado

Saw what appeared to be another case of food-begging among the Plain-colored Tanagers this afternoon. One bird, in the posture drawn on the next page, facing another. The former uttering loud, [[underline]] hoarse [[/underline]], "Treeeet" notes nearby constantly. Sometimes, but by no means always or steadily, these FB notes were accompanied by Q [[?]]. (This would indicate the FB notes alone are loud

Transcription Notes:
end of first paragraph - is word in quotations "unclear" or "nuclear"? I think it is nuclear. - Volunteer opinion nuclear would make more sense, since the use of the word would allude to nuclear in the family unit sense, in a paragraph discussing how gregarious a given species is.