JPMYos 1994 Calidris fuscicollis Arroyo Chico, Estancia Medland, 35 km S. of Tucumc by road, Pto. de Madariaga, Avia de Buenos Aires, Argentina 26 February in the Journal (29 February) linear grid sampling procedure does not entail searching between grids for banded birds. Out of these 5, two three were in the same grid unit as they had been previously. 2 had changed; one RyLyy from submit 9 to submit 10, 200 meters in 10 minutes. The other RyLpr, was lost in 7.20 min later (found) Between 8+7, a change of less than 100 m, then five minutes later it was between Grids 6 and 5, a change of over 400 meters. Of the birds that remained in position, one, RyLop, had not been sighted before. The other two had been seen in the position when I found them today (at 11:30) during previous survey. One, RyLoo unknown to territorial (22 February), the other (RyLir) was known to be territorial from 1/27. Although has not been seen it defending a territory when it was found today, I have been finding it either on submit 2 or between 2+3 (close to 2) frequently (BANDA series 2/11/74). However, it is not always visible there. Returning to those that moved, one RyLyy, which moved from 9-10 to 10 this morning, has been found today at 10:30, on 9. The other RyLpr was first found 4 days ago on Grid 10 (between 5 and 6). Since, it has been found once on submit 6. 27 February 08:50 'rainier' flight by WR in Arroyo - a lot of energy being used to get nowhere. 08:40- Banded WR in Arroyo, looks like RyLag? Ran Arroyo linear grid this morning as I returned searching for birds. Out of a total of 76 WR seen along 3km of Arroyo, 12 were banded. 2 resightings were new, from Grid 9 on 1 January! 28 February. running linear grid at 15:30, in submit #1. Found a typical late afternoon, man feeling flush of WR. It is the first estuarine mud flock that I have picked up in the linear grid sample proper. Not frequently have found them down the Arroyo ~100-150 m at the curve, when I have found 50+ birds. Often buffle are bathing, roting, or preening with the WR flock. When I have stayed to watch such flocks, they begin to disperse by late afternoon, many flying directly toward the roosting swamp. It is possible that they came from there as well, because at the total % of WR along the Arroyo is increased drastically, and because the % of banded birds (10%) is so low compared with that of the Arroyo Chico Swirl (~20%). Do they, like the buffle, come to drink? as the swamp water reflet? 17:30 After checking for banded birds along the linear grid (found 10), on reaching the curve in the Arroyo went to the curve below the tower when a mass of shorebirds had assembled. RyLpr nowhere. Had not seen it since banding 1/15 in the Arroyo on submit #1. A small flock of WR left within