JPMyers 1979 Journal Arroyo Chico, Estancia Medland, 35 km S. of Juncha by road, Alto de Madariaga, Picia & Buenos Aires, Argentina 24 February (cont'!) (1) upstream as feasible looking for WR and bands. In order to gain to the next potrero we had to go by the swamp discussed 21 February (see map in Journal). Bearded (WR) Big Lo was still again there. The number of them seen this morning was incredible. In addition to many groups of 5-10 (apparently fall sized birds), we found one flock of 43 young (of mixed size) with 2 adults. Also 4 wood storks! in swamp near Big Lo. Running N along the Arroyo, between the first 2 fences, N of the linear grid we found 7 WR - not very many, for the 1.5 km of beach. Crossing through the fence on a little blow with still blooming dandelions (Sido-lower llanura near the tower) - in it were 2 traffico. In the Arroyo in this potrero (3km) we found 53 WR (see sp acct). Other species: 3 Neotropic cormorant; 2 Southern Screamer; 1 Cocoi heron; 45 Southern Lapwing; 9 Black-necked stilt; 9 Charadrius fallarlandi; 2 Greater Yellowlegs; 91 Brown-headed gull. After 3km in the northernmost potrero we reached a drainage ditch & over which you can could not pass. So we followed it eastward a short distance, & quickly came to a large swamp with a great deal of open water. Following the edge at their south, we came upon a series of smaller almost dried black-necked swamps with small patches of tule, and lots of Solanum, and a flock of 90-50 WR and 10 or so 00 Ch. fallarlandi, and one [illegible] Pectoral! Collected 5 WR (086, 087, 088, 090, 091) and the solitary Pectoral (089) [see sp acct-wet peck]. Another flock of rhea in vicinity - 20-30. The Ch. fallarlandi appear to use the hard caked mud lying away from the wet foraging area of the WR, but also foraging could just up to the edge of the H2O. There are consistent differences between their foraging areas & those of WR. However, is part of the timing of Ch.fall's migration related too to the drying of their black-necked marshes in late summer? After resting lunch in this vicinity, we returned to the linear grid and at 1300 (temp=25°, shade 10c=48% 1500 ft.) began reading grid again. Another sample began at 1445, then again at 1935. Grid totals: (4 runs) - total given above, total number for both sides of Arroyo together: White rump 21 (15-32)85; Charadrius fallarlandi 14 (11-16) 57; Greater Yellowlegs 1 (0-2) 4; Black necked stilt 1.5 (1-2) 6; Southern Lapwing 11 (5-15) 42; Neotropic cormorant - (0-1) 1; Cocoi heron - (0-1) 1; Speckled teal 0.5 (0-2) 2; Yellow billed pied rail 0.5 (0-2) 2; Brown-headed gull 6 (0-12) 23; Red-wattled lapwing 0.5 (0-1) 2; Pseudoseisura unicolor 1 (0-4) 4; Corvus capensis - (0-1) 1. 33