J.P. Myers 1974 Flacks Estancia Medaland, 35 KMs. of Juanambly road, Pte de Madariaga, Provincia de Bs. Aires, Argentina 30 August I will record due varied observations on bird flacks - any species, size, quality, activities and activities and behavior. Information of this sort has in the past been recorded underapp accent, and will continue to be so for calidrine sandpipers. These observations will be cross influenced here, and if dealing with mixed flocks, rippled expanded. A recurring, frequent site in the skies hue at this time of year are flacks of Bunoida ariiculata, flying generally low over the ground at a height of 30-50' in a tight formation, occasionally spreading out only to compress back again. My impression is that this is the dominant direction at any given time of day, but that may not be so. (15:27), Arroyo Chico, Estancia Medaland, Pte. de Madariaga, Provincia de Bs. Aires, Argentina 6 September 1040-1100 while taking grid data on bird it I also counted Bunoida flying over, noting direction. The flocks were as described 30 August. One interesting observation was that while most (winded, almost all) down were flying S down the Arroyo (and also S out from Nullamos), a few could be seen infrequently flying N, in diametrically opposed direction. Three times then returning flocks (10-30 birds/flock) flew directly into an oncoming flock, breaking it up, causing momentary chaos. The Swad birds typically swerved 10's of meters high at the last moment to avoid the collision. (See WR sp. accent today) time Bunoida flock sizes going south = 250 0942 80, 50, 50, 30, 40, [illegible] = 250 0944 50, 15, 25, 1, 30, [illegible] 120 0945 10, 10, 30, 60, 50, 50, 10, 80, 30, 50 420 0945 50, 10, 30, 40, 90, 50 250 0947 35, 3, 50, [illegible], 110, 10, 30 240 0948 , 200, 80, 30 310 0949 150, 30 180 0950 50, 50 100 0951 80, 30, 30, 80 140 0952 80, 15 95 2105