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[[circled]] 32 [[/circled]]

Tangara, Dec. 9, 1958, V                 

and down, back & forth, quite like the Golden-masks; except that the whole thing looked lower intensity and/or less hostile. The visitors flew down to the cage less frequently, and all 6 flew around rather less frequently and energetically. The Plains also went into the extreme pre-flight stretch less frequently.

Unlike the captive Golden-masks, the captive Plains seemed to become less, not more, vocal than usual while the visitors were present. And all their calls were ordinary single CN's, series of CN's, and CN Trll's [[Trills]](actually there are very few real series of CN's which are not CN Trll's). All these could be given by either or both perching and flying birds. (I might add that this species definitely does utter single CN's and little doublets quite frequently.)

The whole vocal repertory [[?]] of the Plains(again except HAC) might be illustrated by the following diagram:

single CN's ⇌ series of CN's ⇌ CN Trll's

All this seems to be strictly analogous to the less harsh single CN - less harsh series of CN's complex[[?]] of the Golden-mask. The Plains doesn't seem to have anything strictly analogous with the R of the Golden-mask, although the CN Trll may well be strictly homologous.

In general, the whole behavior of these Plains today would seem to confirm the hypothesis that their hostile behavior is comparatively (and possibly actually weaker than that of the Golden-masks. It is not surprising, therefore, that they don't seem to have the same hostile calls. I don't think that any of their CN - CN Trll patterns are really hostile at all, (although they may be the indirect result 

Transcription Notes:
Unsure how to transcribe symbols in diagram - replaced by [[?]] in text. Added ⇌ symbols where appropriate