JPMayers 1974 Tryngites subruficollis 03 Tower Llanos, Estancia Medeland, 35 Km S. of Siuancha by road, Ptdo dt Madariaga Pcia de Buenos Aires, Argentina. 17 January cloud bird and within a few feet on either side of the transect. Other bb's curled land behind or to the side, tnot get chased until they, the first bird had turned around. Chasing involved: raising + lengthening of neck followed by running and then if the other bird was far enough - flight. Land within: 1' or 6" of others. Also seen 3-4 times with other bb's (in 1.5 hr) and once to WR feeding on Corupie (even tho the bb did not then feed on the corupie). Once however wetter bb flew at this one with his beak on the "transect" - This one then turned around + continued feeding. But a golden cama + chased both buffins all. Wing flashes seen in this bird 3 times during morning. 18 January 0655 - buffy baffle - 15m N of tower. Branch jumping + wing waving. No vocalization. Ended with one of the birds being chased away. A buffin within ca 90° arc + 25m N-NE of tower. 0710 - more buffy aggression - in (0,0) bigunto, chasing off another bb. 0711 buffy recorded intact sample (0710) in (4,6) flew to edge of (3,1) (0,0) (4b) + displaced bird. The birds appear more to be much more dispersed than they were when we first arrived - it is too bad that I [illegible] wait till 0655 for the first reading - even tho! I think such a wait was necessary in order to re- move the after effects of our coming. 0713 been watching 2 buffins that came together near (3,6) - (3,3) again. One bird (A) definitely moving toward the other (B) rapidly - and slightly outstretched. Moving flasher just running toward. Very subtle displacement (if it were seeds), at least in terms of display rather than direct attack. I almost invariably kept on one side of B. When they have separated, without penetrating into the area A had been using. 0730. Displacement using wing flashes in (0,6) area. But the "displaced" bird just flew around behind the displacing bird, where the latter had just come from. A directional phenomenon on later has been observed yesterday? 0735 - another bb flight. Began with two buffins (a pair?) flying ~ 55 m (!) in order at other. A' had been crowding beside another bb in the center of the small unit. A' flew directly to the new bird, so as if he made the