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Tangara, Mar. 27, 1961, II

today than yesterday. Their nest is probably more than half completed now.

The A birds certainly do not utter "Tseet"s very frequently. But I think that one or both birds sometimes utter such notes when flying into the nesting tree, or within the nesting tree, in association with Sree Notes.

The A male chased and supplanted the 2 attendant birds whenever they came near the nest Some of his supplanting attacks were silent; others were accompanied by CN Trll's. Sometimes the other dart birds flew away silently; at other times they uttered CN Trll's as they went.  

The A male fed the female once when they were in a tree quite far from the nesting tree. He flew to her with a CN Trll. She pecked at him as soon as she got the food, and he then flew away silently.

Tangara, I

March 28, 1961
Barro Colorado

This afternoon I watched a flock of 7 Plain-coloreds moving about in the general neighborhood of nest of pair A and the area where the pair which built a nest by my house has been for the last few days(I shall call this latter pair "AA"). The flock was almost certainly composed of 2 family groups, i.e. the A birds with their 2 attendant young, and the AA birds with their 1 attendant young.

This group was a nice example of intra-specific gregariousness during the height of the breeding season. The birds stayed together, following one another over great distances, for at least an hour.

(There has been one apparently unmated Golden-mask around the clearing for at least a week This bird stayed with the flock of Plain-