JPMyers 1974 Tryngites subruficollis Tower Llanos, Estancia Medland, 35 km S. of Juanando by road, Pte de Madaranga, Pteia de Bs Aires, Argentina. 15 January (cont'd) but the Sierra Southern most 3 continue moving together. B remains (or think it is B- as its general movement has been in the same direction but it is slow. He has moved ~ 30-40 m, the others ~ 70-80. 1915- S and 3 even closer now, B left behind). 17 January Less than 15 minutes after we cleared out a herd of cows from the immediate vicinity of the tower, a fixed flock of 50 birds (~ 40 WR + 10 buffle) moved in to the de-cow area. Buffles using cougiris on Llanos + on [illegible] card, but in the former habitat they were also foraging in the grass. by 0810 seen several instances of picked out several territorial buffles, both on + off grids. Began reading grid 4 at 0820. However I don't believe that by now (0820) there are as many buffles as there were when we arrived, or at least that now they are more spread out. 0915 - both L and T again are unimpeded by the greater dispersal apparent now - the birds have spread out both on grids + in drainage. 0935 - buffy appearing beyond (9,8) just outside grid - looks like territorial bird. 1035 - almost all the local buffles left following a golden call. We did not see any disturbing factor. During the morning we have been watching one buffle near the tower just above the chainage - it defends a small territory (continuous ridge, on the order of 20-40 m in diameter, perhaps less) against other buffles. Within its territory is a WR, also territorial intraspecifically. The buffle on occasion chases the WR - running toward it. This happens even though the WR does not flee. 0930 Lois started watching one Buffle across the chainage, ~10 m beyond the edge of the Llanos. It walked a transect: feeding on rooting, sometimes stopping to forage intensively in a small area, then continuing on in the same direction. At it walked back and forth ~ 4 times along a ~25 m route, turning regularly at the same spot. In its vicinity were other buffles, goldens, WR. It appeared that a territory defended area existed only in front of the