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12 Tangera I March 3, 1958 Barro Colorado Watching a few Plains in trees. Several pronounced G's before attack. Also one bird stood several times in a completely [?] posture; but with drooping & fluttering wings. This looked rather like the wing-fluttering which precedes general [?] in such species as the Shining Honeycreeper; but it apparently provoked other birds in the flock (at least 3, one right after the other, to fly toward the fluttering bird. The flutterer retreated each time; and so nothing developed. Was sex involved in this?? Tangara, I March 22, 1958 Barro Colorado I have been looking around to see if any of these Tanagers do anything which might be the equivalent of the "song"s of other species. The only thing I have seen was one case of a solitary male (perhaps one of the birds of a pair which hangs around the clearing here) Golden-mask which gave repeated R's one day while perched on the topmost twig of a bare tree. But I have certainly seen plenty of cases in which one bird of a pair appeared to be quite unmoved when its mate flew away. And I have not yet been able to distinguish any [?] of PCN in either the Plains or the Golden-masks.