SP Myers 1979 White-rump 03 Rk 11 Pond at Farmhouse Rd, Estancia Meldland, 35 km S. of Juncal by road, Pteo. de Madariaga, Proia de Bs. Aires, Argentina 10 January cont'd "A" and "B" share a bumbung, and I have seen fly supplements ("B" by "A"), a varying number of WR appear to operate between "A" + "B". It is conceivable that the non-territorial birds has a territory on the pond by the car, and that we are penetrating it from returning (see Pet sp accent-this infor for one of Ham. 1645 collected "A" - adult ♀. "B" had disappeared, perhaps as a result of the excessive Pict interaction at the time (see sp accent). Grid 5, Arroyo Chico, Estancia Meldland, Pteo. de Madariaga, Proia de Bs. Aires, Argentina 15 January settling birds on arroyo. One WR in anago on mud at ~0300! Caught 7 WR - banded (colour+ USF+WS (82152017, 82152024-30) Nobody died. W 1 km W of Farmhouse on Farmhouse Rd, Estancia Meldland, Pteo. de Madariaga, Proia de Bs. Aires, Argentina Outlaws 1540 stopped at puddle by road (mud, formed by tractor excavation this western summer) to try + get territorial birds from flood of water spotted while passing by. ~110 birds than originally. A number of apparently territorial WR there. Fairly good airview so far (1610) only on one, although among the others BA catch typical behaviors associated with territoriality. Following one bird. Best evidence for territoriality: when body moves from this bird, the furthest east along the pond : it (A) has a neighbor (B) to the west, which intrudes frequently into A's feeding area - i.e. B wanders east + is frequently chased away by A. One case was particularly convincing that I am seeing territoriality rather than a personal space phenomenon: A wandered off to grassy area between pond + road, about 40' away from area which he has been defending. A began feeding, looking up very frequently. This was especially striking because when it was feeding it disappeared in the grass, but when it looked up its head popped up. B, after a few minutes of A's absence, began working E onto the area from which it had previously been excluded. I began to think that the system had broken down, that I was misinterpreting it or that A was just not territorial. But then all of a sudden A began working back, fast + directly, to his territory, + immediately chased B back W. At the end of the occupation in this area was something behavior by both birds: marks (like which I had had thought to be their border. Within the flood we are seeing a lot of crouching - this pair especially. When we drove up there had been a bird in the road which we speared, bird to the pond. Now due to this again, sitting in the middle of the road - in fact, squatting with feathers on the ground.