JPMyers 1974 Journal 16 Tower Llanos, Estancia Medeland, 35 Km S. of Juancho by road, Ptdo de Madariaga, Provincia de Buenos Aires, Argentina 18 January conts walking while feeding, rather than flight to an area. [illegible]. Should have noted that the 19740 flight was not a massed flock affair, but rather theatrin of many individuals (or so it appeared). By 1815 bufffis were on Grid 4 - working on the ground from E to W. By 1830 they had reached the edge of the habitat at the arroyo. 1819 saw first aggression between bufffis or grid. (data see app accent. 1857 found flock of WR, Pectorals, Golden + Bufffis out between 11A+11B: 50 Buffbreasted, feeding; 8 Pectorals, preening 14 Pecks resting; 15 WR resting, 2 Goldens, feeding; 2 Goldens preening. These birds were grouped within the flock by species - pectorals with pectorals, WR - WR etc. But bufffis feeding throughout and goldens around the periphery. This flock was not present at 1830, + probably flown in c. 1845. 1857 still there. 1858 banded WR (see app accent) 1903 - multiple specific assembly still there. 1912 - 54 WR roosting on beach. Prospecto, 3 bufffis on outside of flock. (WR divided into 3 groups, but all within 10 m x 10 m area. 1920 Multi-specific flock of birds displaced by herd of sheep Took final reading at 2005. During the last 5, it was apparent that the bufffis were coalescing, forming tighter flocks, foraging without aggression despite proximity (see app accent). Grid totals for afternoon: (10 samples): 4a Buffbreasted 3.4 (0-10) 34; Golden Plover 2.0 (0-3) 20. 4b Baffy 8.1 (0-12) 81; Golden 3.1 (0-5) 31. Note that no other spp. were picked up in grid samples. Also have following data on one bafly. Grid 9, Estancia Medeland, Ptdo de Madariaga, Provincia de Buenos Aires, Argentina Show part #9 on return from Tower Llanos, ~@2100. Flock of about 50LY/lego roosting in grid in area of heaviest Solanum (durayguille) growth. First concentration of shorebirds that I've seen here since 5 January. Light warpoon, so that a survey for other spp. difficult. Saw no others obvious among the Yellowlegs. 6 Pectorals flying over, but did not land.