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[[circled]] 44 [[/circled]] Tangara, Oct. 18, 1960, I [[Image - sketch of a bird]] FB & Q Posture (I don't know if the bill was kept open or not) Blue on wing not visible Tail sometimes raised a little higher. None of this FB provoked any response. Tangara, I March 19, 1961 Barro Colorado I have been watching wild Plain-colored Tanagers quite a lot during the last two days. They seem to be right in the midst of the breeding season. One bird is sitting on eggs right outside my window. I have now come to the conclusion that the CN trill of this species is not just (or not always) a higher intensity version of the CN. I think that all or most CN trills may contain a hostile component. Most commonly uttered by birds flying in flocks. Not always uttered when mates flying together. Males may utter single "Trit"s instead. I watched one pair flying about in the trees together. Usually making short flights from branch to branch. Very rapid. During this performance one or both birds uttered lots of single notes. There have been "Trit"s (in which case they were probably ordinary CN's), or, more probably, [[?]] at longer "Treet"s. If these were "Treet"s, they may have been homologous with the SN's of Palm and Blue Tanagers. Once the mate of the incubating bird came down to a bush next to the nest and uttered a lot of single notes which seemed to be intermediate between "Trit"s and "Treet"s.