Tryngito subroticellio Tower Llanos, Estancia Medeland, 55 kms. of Juancho by road, Pto de Madariaga, Provincia de Buenos Aires, Argentina 20 January (cont'd) buffy continued surveying in the direction in which it had been flying, + the every-lifter returned to its original position. 0636 R is still controlling its area, in low central + right corner of (0,0) of 4b. Frequency of aggressive also appears to have decreased markedly in last 10 minutes. When there is aggression, it occurs in spurts: a supplanted bird containing gets chased, shoved into someone else's territory, + is chased again, etc. etc. this can cause 5-7 checks within a minute or two, then everything is quiet for awhile. It appears now that the buffies are following closer up around than before. Some ice within 1m of one another. 0643. R appeared for first time since before 0636. R moved somewhat to W. the bird playing within small area, feeding continuously. Not like "patrolling" bird watched 18 Jan. 0710 all local buffies within 25 m radius previously, but by 0714 they were fighting again + feeding. at 0710 there were buffies across the drainage were not ploving. 0718 - when 2 buffies are fighting intensely (hopping, jabbing etc.), & between the hops they enter a "pointed crowd" - necks extended, bill pointed forward other bird down towards but 6"-8" apart. We have seen "hoppings" lasting between 2 + 10-15 sec Lois watching 0722.- Grufio since 0700 has been patrolling drainage area cliff across from tower, similar to 1/18 bird. But this bird works both N + S sides, feeding in overhanging grass + occasionally wandering afewen from edge of cliff. Keeping away all other buffies + inconsistently chase WR. 0723 flew across drainage + chased bb on other side. Patrolled entire edge + lower parts of cliff. One other difference between 1/18 + 1/18 bird in their approach to the ledge: 1/20 bird jumps up for half flight whereas 1/18 only walked up, using ramp path. Suggests that they are different birds. A nearby aggressive golden plover has been hassling 1/20 with a grey bird infrequently. 0721 2 buffies fighting in immediate vicinity of tower; fighting again at 0728. the first frightened with them crossing (both). One remained in crowd 5 min. The other remained 2 min, after which it began feeding. Stayed within vicinity of the first bird. Occasionally 5 min bird would stretch hill out + flutter into fight against