S.P.Mayers 1944 Tryngite subbifurcata Tower grids. (1,10) region, Estancia Maldonado, 35 km. S. of Francha by road, Alto de Maldonado, Pina de Bs. Aires, Argentina. 12 November (Cont'd) no diffing middle of Sample (i.e. half way through the ~ 6 min it takes to read the grid) - Run was a burst in golden calling and for a moment I thought that the bird was going to fly. 0905 - supplanted his beginning between the tower and 16b, less than 20m from tower, one of three birds has part of its territory on 16b (which is not part of 16b). the behavior of the chased bird was interesting: it ran with both wings up and out. Chaser has now gone off to rest behind clump of grass. 0906 - seen (3,3) - two birds sitting very close (~1m) as if in the bil-tiled postura. 0912 - 2 successive chases in 16b involving same birds, followed by the chaser going after a 3rd bird. Under Airports. Later two participants began to peep. 0918 birds all spooled, posta. (I saw hole in 930 before spool) [Note on 11-12-74 T, buffy which bois followed on 16D: during first portion of following period 11-12-74T was quite active in supplanting what was apparently a disheveled flock running through. Once they were gone, freq. of aggression dropped, though A was consistent. Appears to feed largely around the PERIMETER of the trailing face following data - few points lie within the perimeter) No apparent borders, nor any males, but buffies. One Rivalis was a solitary in the area most of the time.] 0928 - since the birds spooled there has been little aggression. They have been wandering directionally, toward areas where S-S ag. had been occurring, but on route little. 0929 - head up ad chase, another heli, coming up. Wow - that occurred only once the birds reached the area. Supplantation again - 0934 - more supplantation in 16B. 0944 - spooked again - landed almost immediately afterwards (0948) 0947- a series of ten supp. began. - birds again heading directionally towards 16B. Another heli flight - This bird landed running up wings spread out as it chased. This spook began as we could hear the calling spread, agitatedly near the bird flew again in golden calling. I should mention that this last spooked the flock landed largely in (2,1) and went toward 16B. This time they landed in (1,1) and went forward 16 B. The ten buffy in 16B actually ran at a physical!!! The Ploy jumped at the turned on the buffy. Now preening. Series of supplantations in 16B just before 1000. Also (3,6) region - heli and call. Supplantation in 16b involves a sandwich