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18 Ramphocelus, Mar. 20, 1958, II I have also heard a third bird answering the CN's of a pair. This might suggest that the CN's are at least partially hostile - which seems probable anyway, in view of their resemblance to the HAC Notes. The "real" (?success?) of "calling in" the note seems to be the use of PCN's - I think. This is certainly what the sound itself would suggest. (The PCN's of this species are not unlike the plaintive CN's which (?Thraupas?) tanagers use to "call in" their mates.) And I have seen one bird of a pair, which had been feeding off by itself and giving CN'S (apparently as a response to CN's by its mate), fly back to this mate with three or four "Wheet" Notes. And the 2 birds of the pair seemed to be perfectly friendly when they got together, relaxing immediately without any signs of G, MCN's or other over unmistakable hostility. I watched one aerial chase apparently involving mates. One or both birds of the pair uttered definitely muffled MCN-like sounds during the chase - so perhaps this species has a "real" WhN pattern after all! Ramphocelus, I March 30, 1958 Barro Colorado The capture Yellow-rump gave its usual R, in the usual way, when a Sangre de Toro came too close this morning, but this time I noticed that the R was followed by a definite Rsp!!! This sounded just like the Green Honeycreeper (although the Rsp was perhaps a little weaker than most of the Rsps of [[chlorphaues?]]