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Tangara, Mar. 28, 1961, II

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colored Tanagers for minutes on end this afternoon, but it tended to keep less close to the Plain-coloreds than they did to one another. The Golden-mask also tended to leave the flock from time to time. At least twice, when the Golden-mask was in the flock, it was attacked by one of the Plain-coloreds. The Golden-mask always retreated immediately without display or resistance.

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The vocal patterns of the Plain-coloreds this afternoon were interesting. When moving about, in flight, they tended to utter a lot of ordinary CN’s. Sometimes single. Usually in short series (perhaps usually 3-7 notes). These series were not usually as rapid as the notes of CN Trill's. There were quite a number of supplanting attacks and chases in the flock from time to time. It was only during these attacks and chases that one or more of the birds uttered ordinary CN trills and/or unusually loud and hard CN trills. (I am quite sure that both types of CN trills were uttered. But not always during the same reactions. I think that ordinary CN trills and unusually loud and hard CN trills are easily told apart.) I did not hear any “Treet” Notes of “sreee”s this afternoon. The vocal behavior of the birds this afternoon may have been quite typical of the “non-breeding phase.”



Tangara, I   March 29, 1961. 
Barro Colorado

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The Plain-Coloreds are still in a flock this morning (I am writing this at 7:05am) At least 6 birds moving around together. They all come to visit the tree in which the A’s built their nest; but only stay a few minutes.

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The A’s themselves, who are presumably included in the flock,

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