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Tangara, Aug. 2, 1958, II

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a Plain Tanager, to form, I hope, a "revived flock" as in the wild. So far, however, the species have kept very well segregated. I have had all the birds some time, and have kept them in small cages, each species by itself, until yesterday; but I have had the Plains considerably longer than the Golden-masks. This may or may not explain the differences in behavior of the 2 species in the aviary; but it is actually true that, in the aviary, the Plains are tamer than the Golden-masks, going down to feed more readily when I am around, i.e. have an apparently weaker internal escape drive. The Plains also seem to be less aggressive than the Golden-masks. At least the Golden-masks can usually force the Plains to retreat by very slight supplanting attacks.

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The only definitely hostile pattern shown by any of the caged birds so far was a single G by a Plain; without ritualized postures or movements, when a Golden-masked tried to make a supplanting attack upon it.

I now have the calls of the 2 species down a little better; and I can confirm some of the things I noted previously.

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The CN's of the Golden-masks are certainly just what I thought. Frequently single notes; frequently in accelerated series when the birds fly. Definitely harder in tone than the CN-trll's of the Plains. A single adult ([[male symbol]]?) came to visit the captive birds today; and flew down to the top of the aviary, (where he was hidden in the leaves of the vines growing there), and uttered a lot of single CN's which were even harsher than the usual ones. There may possibly have been a "different" (aggressive?) display??? All the other CN's of the Golden-masks