J.P. Myers 1974 Calidris fuscicollis (15,27) Estancia Medaland, 35 km S. of Juanicho by road, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 6 September - 0930 observing WR on grid 11. See journal + grid data book. 940 - been watching them for 4 minutes since 3 WR and one Baird's flew onto the grid. Foraged steadily upstream (slight breeze today) from the pt where they landed in a tight flock, into the birds all within 1 meter m of one another. In 4 minutes they moved 22 m, i.e. 5.5 m/minute. At that point they left the grid, still in a very tight flock. 0957 - the WR have become 5-6 softfeather staging within 1 m of one another; then another is clearly visible, but the 3rd is ~30 m away with a Baird's. One of the together group appears to tail lower each time that it sticks its head under water (water bend) to feed, whereas the other plunging to comparable depths, do not. See no reaction by the other bird, nor does there seem to be any crucial distance determinant for the behavior. 1002 - they flew. 1 Baird's and I we joined them in flight and they landed 15 m downstream. (5,13) to (15,27) Arroyo Chico Estancia Medaland, 35 km S. of Juanicho by road, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 11 September see Baird's sp. accent re-composition of prep flocks today. picked up a large flock of WR this morning between subunits 6 and 7 ((15,12,20)). They flew back to subunit 5. + D followed. Miracle of Miracles!! 0905 Rp Lg - banded 15 January 1974 in subunit 1 was in the flock I last saw it 18 April in subunit 4. The flock was feeding madly between frequent short flights up and down the Arroyo. 0930 began reading grid 12 - 14 WR and 16 Baird's, but only 2 of the latter were on the grid (while 8 WR were) for during first reading, 0943 most birds flew because of a cow in vision. But by 0945 they were back, grouped at the high end. After a series of disturbance courtesy of cows, sheep and a ? ranchhand 1030 collected 2 WR at (13,24) (2,3) La Orqueta, Estancia Medaland, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 14 September very successful per-dawn banding session. netted 11 WR. See banding schedule, journal (10,13), Arroyo Chico, Estancia Medaland, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 15 September see Baird's sp. accent re mixed WR-Baird flock behavior in evening. (15,26) Arroyo Chico, Estancia Medaland, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 19 September 0812 began watching a flock of WR ±100m S of grid 11. 24 birds + 74 WR flew in later. Wind very light. Within the flock I do not see the expected parallel circuitous manifest