J.P. Myers 1974 Journal (8,12) to (13,24) Arroyo Chico, Estancia Medaland, 35 kms of Juancho by road, Pato de Madariaga, Pcia de Bs As, Argentina. arrived at the curve below the tower, (8,13) in Arroyo Chico, at 1700. The water level has increased somewhat since from its low level just prior to the 12 September rains, reaching a level comparable to that which we encountered in Medaland 23 August upon our return. Cloud cover this afternoon: 190%, with a coastal fog poised to Haulet up bright. Slight SW wind, temp. 215°C. We drove from the curve (8,12) to (13,24), country pears as we went. Very few were foraging in the Arroyo, a total of 13 bairdi, 9 francolli, and 5 Charadrius falcklandius. Perchance the recent increase in the level has rendered the area less attractive. (5,21) Estancia Medaland, 35 kms S. of Juancho by road, Pato de Madariaga, Pcia de Bs As, Argentina. 1730 - as we were turning around in (13,24) to run back down the Arroyo, Pichon (a local peón) and Pedrito (the Huici's nephew) passed by as they tried to hunt paca with bateador (unsuccessful), and a very infrequent activity probably provoked by the nephew). As they passed they spooked into flight a large flock of upland shorebirds. We drove near to the birds in order to census the flock and watch. This field I censused 26 August with a diagram. The flock was distributed largely in the upper areas of the field, but spread well into low places. There was no obvious habitat division by species. Present within the flock were 180+ Florialis dominica (≈250), Tryptate ≈75 Tryptate, 100+ bairdi, ≈20 Zonibys. The height of the grass made species census difficult, particularly for the calidridiids, low light and the great size of the flock compounded censuses. No Oropholus. Birds began to leave at 1750, then a group of Zonibys. Buffets began to fly at 181755 when one flashed a wing, but the first flights were local, i.e. between different parts of the scene field. 1800 almost exactly the flock took off (see Trying to supp accent 10,4 September). The flock swirled overhead and broke into smaller flocks, many of them single species composition. I tried to follow Tryptate, but wound up with a large bairdi flock and our Tryptate. After 2 or 3 minutes of flying over this field they went to the ESE at a higher altitude, some splitting off to the south. I can fairly certain that they roosted in the (21,20) area, as for 5 minutes after they lost altitude, they flew low over this area, circling low, landing, taking off again - typical pre-roost behaviour. As I watched them infrequently a Tryptate would pass through my field of vision