5PMylars 1979 Journal 36 Tower Llanos, Estancia Medeland 35 Km S. of Juncal by road, Ptdo de Madariaga Pcia de Bs. Aires, Argentina that buffers were present at least by the time of my arrival. Temperature at 0630 = 15° Sky = 90% clear except for a low mist rising to ~10m. Slight NE breeze. Sunrise = 0731. At 0735 1/4 in 2m = 130 feet (whence in shade = 50 ft.) White-rump and Cliff Swallows going by. Buffets on grids and on beach in Arroyo, especially in old cow grounds. Sampled until 0900 Grid totals: #10 (16sample) Buff-breasted Sandpiper 3.3 (0-7)50; Rufous-backed Negrillo 0.2 (0-2)3; Conovera pipit 1.3 (0-3)21. #4 (3sample) Buff-breasted Sandpiper 8.3 (0-15)25; Rufous backed negrito 4 (2-6)12; Conovera pipit 1.3 (0-3)4. Effect (leaning the telel) Cacatua Arroyo Chico, Estancia Medeland, Ptdo de Madariaga, Pcia de Buenos Aires, Argentina After leaving the linear grid read one sample from the linear grid, beginning at 0900. Total: White rump 19,15 (34); Charadrius fallaxlantius 7.9(16); Alaudia gahni with Pectoral Spiper 1.0 (1); Hudsonian Godwit 1.0(1); Greater YLega 0.2(2); Southern Lapwing 7.4(6); Rhea 0.3(3); Neotropic Cormorant 0.1(1); Cococeran 0.1(1); Conovera Pipit 1.0(1). This was followed by a run along the linear grid, searching for barked Lerk and counting all birds. totals: White-rump 30, 46 (76) total; Charadrius fallaxlantius 14,26 (40); Hudsonian Godwit 0.1(1); Greater YLega 1.2(3); Black-necked Stilt 0.2(2); Southern Lapwing 1.3(4); Neotropic Cormorant 0.2(2); Speckled teal 0.12(12); Brown headed gull 1.0(1); Tridactylus tern 1.0(1); Rufous-backed negrito 0.2(2); Conovera pipit 1.0(1). Included in total (WR) 6x11 (18) 100% from the grid (noted at Grid 9! Univerer, Ryleg has gone from its territory. 28 February Rained 10mm between 0500 and 0700 this morning. Went to Linear grid at 1530. Rain does not appear to have raised Arroyo (which is still on its way down). Grid totals: White rump 6,52(60); Buff-breasted Pipper 0.2(2); Pectoral Spiper 0.1(1); Charadrius fallaxlantius 6.3(9) Greater YLega 1.0(1); Southern Lapwing 12.3 (15); Brown-headed Gull 1.0(2); Southern Screamer 2.0(2). Six WR apparent (re large number of WR). After running down the storage looking for barked birds. Lighting was poor. I found 11 barked WR (between the Arroyo and at least 10 and the error Loberato tower. At 1745 I climbed into the tower, watching for movement on the Llanos and from the storage to the swamp (See WR and Buffy apparent). 3 golden plovers on Llanos