JPMayers 1974 27 Journal Linear Grid, Arroyo Chio, Estancia Wedland, 35 Km S. of Juninbo by road, Pelo de Machuipa, Pucia de Buenos Aires, Argentina 16 February (contd) Buffy - (0-1)1; H.godwit - (0-1)1; GY Legg 1 (0-2)2; Brown headed gull (1(0-2)e Cow 5.5 (0-1)11. 0515 We were back in the Arroyo, and began reading the linear grid again. The number of WRs foraging on grid was down perceptibly even without resorting to counting totals. Also Chaunadius falki appeared to be fewer. At 0745 I encountered a number of individuals of both species up away from the edge of the art sand, panning. They were not near the grid and thus not included, even if on a strip of sand deal with one of the subunits. By two units (6+8) and just beyond the ends of the grids, were flocks of bathing WR (5 and 8 WR respectively). After finishing this run we drove to the fanatum of Right Y L Grey and took 60 min. of following data (40 sp. acct.) Then at 1930 began another sample of the grid. WR numbers returned to more previous levels of other days. We finished this reading at 2001. By this time birds were beginning to flock (one species), Returning to Grid 12, took one sample at 2015. Then went to the end of the grid and driving along the sand, counted birds within and between subunits on both sides of the arroyo to the end of the grid. Total of 91 WR were in the Arroyo then, 27 on the subunits and 64 between. Grid totals for the afternoon: Linear Grid: White rump 20.5 (14-27)1; Chaunadius falklandicus 16.5 (14-19)33; GY Legg 1.5 (1-2)5; LY Legg 0.5 (0-1)1; S.Lapwing 19.5 (9-20)29; B.H.gull 3.5 (2-5)7; Trudeaustin 0.5 (0-1)1; BN Stilt 0.5 (0-1)1; Speckled teal 8 (6-10)16; R.h.Neotis 0.5 (0-1)1; C.pipit 0.5 (0-1)1; Maguari Stork 0.5 (0-1)1; Cow 3.5 (0-7)7. 2 things of interest - huge flocks of Bendolidae were seen (see sp. acct); small flock of Fork-tailed Flycatcher in Arroyo, the first of their kind I've seen for several days, they appear to be migrating already. 17 February Began sampling linear grid 0850 from subunit 1, completed at 0925. Added. Ran only once. Totals: White rump 18; Cha. falki 17; S.Lapwing 7; BN Stilt 1/4; Brown headed gull 3; Cacoi Heron, 1; Hudsonian Godwit, 1; Cinclusa pipit, 1; Speckled teal 1. ☼ Weather was cool (15.5°) with a heavy overcast (cloud = 90%, WC = 1000 ft). After completing the sample I returned to near subunit 3 in order to observe on Grid 12. Took 1 sample, what 5 min cultural