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[[circled]] 36 [[/circled]] Tangara, July 11, 1959, III ing. In ordinary perching posture, with wings held out, drooped, & Q'd vigorously. No trace of ft or tail movements. Accompanied by the usual type of nasal, buzzy, rather plaintive notes: "Zee zee zeeeaaauh zuh". Sometimes the series much more prolonged. Watching the birds in the "feeding [[?]]", I also saw a very vigorous fight between two silver-throats. Both birds adult actually fell tumbling all the way down to the ground. Accompanied by harsh buzzy not as "Waaaanh waaaaaaaanh waaaanh." Obviously a form of HAC quite like the FB notes of the young Bayheads in actual sound, but harsh (rather than plaintive) in quality. The resemblance between the FB notes & HAC notes of these species is quite remarkable. Probably greater than in all or most of the other species I have studied. This might be [[?]] as an indication that the FB notes contain a relatively strong [[?]] component. Tangara, I. July 12 1959 Cerro Punta I have seen a couple more aerial fights, or at least [[?]] of HAC calling, when one silver-throat approaches another. This certainly seems to be one of the most aggressive species I have studied. I was ever reminded of the aggressiveness of the Green Honeycreepers this morning while I watched the Silver-throats. There seems to be in doubt but that the Silver-throats tend to feed at lower level of vegetation than the Bay-heads, on the average. There is terrific overlap between the 2 species, but the Silver-Throat feeds more often in moderately low-vegetation; and sometimes comes much low