SP Myers 1974 Journal 76 Tower Llanos, Estancia Mikeland, 35 km S. of Jumello by road, Pto de Madariaga, Pcia de Bs Aires, Argentina 20 April (cont) S Rhen, a flock of ~50 Sicala lutaola. I fired two swallows now; all are WR's - no cliff. any more. (See Zonibyx sp accent) Arroyo Chico, Estancia Mikeland, Pto de Madariaga, Pcia de Bs Aires, Argentina Returned to Arroyo in late afternoon and at 1752 began taking following data on Ry100 at subunit 5 (all WR sp accent; linear grid following data book). There is at least some as yet of a territorial spacing system remaining within the WR's here along subunits 4,4-5,5, on the linear gird. However the Zonibyx and Zonibyx offer a much more clear-cut case. (Cloud cover 90% with a moderate N wind. Temp = 12°. Stormy-looking. See [illegible] WR sp accent) also [illegible] Vanellus sp accent.) 22 April temperature this morning at 0800 = 7°C; sun an horizon at 0821. 0% cloud cover; wind = slight from S(0). I began reading the linear grid at 0826. Grid totals: White-rump [illegible] (total) 12, 0(20); Hudsonian godwit 3,0(2); EY leap 1,0(1); Southern lapwing 0,1(1); Charadrius falcklandius 5,18(23); Zonibyx modestus 0,7(7); Black-nucked Stilt 5,10(15); Maguari Stork 0,4(4); Cocciheron 0,1(1); Speckled teal 0,13(13); [illegible] Polyborus plancus 0,2(3); Milvago chimango 0,1(1); Cecoitha cunicularia 0,4(1); Grindales fussus 1,0(1); Corydothera japt 0,1(1). Running down the Arroyo after the grid sample, total were: [illegible] between subunit totals White-rump 22,57 (74); Hudsonian godwit 2,8(10); Southern lapwing 4,10(14); [Golden Plover] 1,0(1); Charadrius falcklandius 16,40 (56); Zonibyx modestus 6,11(17); BN Stilt 9,6(15); Maguari Stork 1,2(3); Yellow Billed Tern 0,2(2); Speckled teal 0,1(4); Ansercicolor 0,2(2); Brown-hooded gull 3,3(6); Cinclodus fuscus 0,1(1); Cecoitha cunicularia 1,2(3); 2-banded Negrin 2,4(8). 9 banded WR, 7 landed Chyfalk and 2 Zonibyx. (see WR, [illegible] Chf. spp accent). After running down a panel over the Nuevo, seeing ~25 Zonibyx (all species), 100+ Thaincorus, 10-15 Ocrephodus, and 0 Tryngites. 1023 began taking Ry100 WR following data (see WR sp accent). The wind, which had changed to now out of the South and strong so pushing the wind up the Arroyo, piling it up. 23 April netting on subunit 1 - put up net by 0740. There was a minimum of 2 WR roosting marks, as well as Ch.falcklandicus. Netted 3 WR, 3 Ch.falls, and 2 Zonibyx, all fly-fleck 2 landed except for one Zonibyx which perched in the net (collected:135)