JPMylers 1974 Journal Tower Llanos, Estancia Meckeland, 35 Kms. of Juancho by road, Ptdo de Madainaga, Provincia de Buenos Aires, Argentina 20 January arrived at tower 0515. No buffets until 0535—when they arrived en masse. Although course had broken 3 of 4 guy wires they were not in the immediate vicinity of the tower (~1 km to E). broken thermometer. Wind slight SOUTHEAST. Extensive cloud cover (70%), lightening on horizon. Many WR on beach. Rufous backed antpitta for- aging by 0545: 2 lapwings, + many goldens. By First sample Grid 9 at 0545—Z Band WR spotted early in morning (are apparent). Some interspecific aggression on grid between Bt+ WR, but most is intraspecific. We were cleared from tower at 0800 by thunder- storm. Grid totals 4a: Buff breasted 4.1 (1-8)37; Golden 3 (2-9)27; White rump sandpiper 0.2 (0-1)2, 4b Buff breasted 9.8 (2-15)87; Golden 4.9(3-6) 43; White rump sandpiper 0.2 (0-2)2; Southern lapwing 2.3(2-3)21; WR swallow 0.8 (0-5)7; Correndera pipit 0.6 (0-3)5. 23 January all times hereforth are Argentine daylight saving — last night Peron caused the switch as an energy saving device. So what was before 0500 is now 0600, etc. Arrival on Llanos at 0600, repaired guy wires, + climbed into tower. Weight at 0700 = 25 x 25m, 5x5 units 700 fteakto. Last night we came out to tower and placed Grid 10 between the tower and (B,O) of 4b. Then to an area in which we have been seeing many buffets. I should mention, that yesterday evening a flock of 7 Hudsonian godwits landed briefly in 4a, and that some of the campsites in the area had typical H.G.-made picking holes. This morning at 0701 the w Hudsonian 6. flew onto Grid 10. Buffets, S. lapwings, golden plovers, and white rumps are in the vicinity— foraging. First grid reading at 0700, temp = 14.5. (Wind mod SE, Clouds = 40% (+ growing). 0730 Ruddy Turnstone on sandy putty beach; white rumps, Ch. Falklandia, G. plover, Lylep and H. Godwits near turnston beach. Lapwing aggression in (01)(02)(12) of 4b—there is an almost fledged chick foraging in that region. See the 0730 chick-centered 4a,4b grid reading for a clear demonstration of the effect of the lapwing aggression From 0730 - 0740 took buffs following data on Grid 10, + then have a gap in