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Tangara, I

November 14, 1959
Barro Colorado

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In the course of watching mixed flock behavior, both D.F. and I have repeatedly noticed one Plain "begging" from another. Probably the begging bird is young, (dull plumage). Its begging consists of Oj only (only of the wings -  not the tail), without any trace of ST or other ritualized posture (its head is usually low and more or less level with the back; but even this is variable), and a "begging call" (BC). The BC consists of repeated "Zhee zhee zhee..." notes. Quite reminiscent of some calls of the Bauauquit, but definitely slower in tempo. As far as I can tell, this O & BC never or about never provoke any response from any other bird (I now just one case which the bird giving Oj & BC was clearly approached by another bird - its parent? The O & BC bird may have been fed during this incident; but I didn't see the performance well enough to be sure.) The lack of response doesn't seem to discourage the O & BC bird, however. It is constantly following and trying to approach another bird(s) (probably but not absolutley, always the same other bird), doing O BC in all the intervals between flights.

Tangara, I

November 17, 1959
Ceiro Brija

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[[green with purple hash line]] = lovinia = Rufous-winged Tanager
There is at least one Rufous-winged Tanager here. Probably no more than one, always solitary. (At least, I have seen a single Rufous-winged Tanager 3 times, and it was always solitary - not associated with other birds of the same or other species.
Quite active and utters like other Tangara species.