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[[underline]]Cyanerpes[[/underline]], Apr. 12, 1958, II 77 The other ♂, white left, doesn't seen to have reacted to the absence of the ♀'s at all. He has just sat, slept, fed, & preened all afternoon, in an apparently perfectly relaxed manner. (In this connection, it might be mentioned that the blue left ♂, although he has completed the pre-nuptial molt, still has a little green on the tertials__so he may be a first-year bird. The white left ♂ doesn't have any green anywhere. It is also quite possible that the difference between the 2 ♂'s is due to the fact that the white left bird is already passed the peak of the breeding season.) As far as I can tell the 2 ♀'s have done nothing but fly about and utter a few CN's and (less frequently) HCN's. [[underline]]Cyanerpes[[/underline]], I April 13, 1958 Barro Colorado The blue left Blue ♂ has done fewer WS's today. Is this a sign of negative conditioning? It is obvious, watching this ♂ yesterday and today, that he only begins WS when all other drives (except preening) are low. It almost appears to be a "residual" activity (This also seems to be true of the singing of all or almost all the other species I am studying.) The white left ♂ hasn't done any WS's at all yet. (In this connection, it may possibly be significant that the blue left ♂ seems to be the dominant bird. At least, it can make supplanting attacks on white left, and force the latter to retreat.)