JPM Myers 1972/ Journal Grid 1 (Farmhouse Puddle) Estancia Medeland, 35 Km S of Francisco, Part. Jock Madariaga, Proia de Bs Aires, Argentina 1 January first yellowleg call. Netting was moderately successful: 4 Piedrots, 3 white rumps, 2 Zonotrichia, 2 Sigalis. The sandpipers received USFWS bands + color bands (see S.p. accent + banding schedule) the finingillito nothing - what monsters they are in a net. By 0645 a fierce storm was imminent. Not wanting to be holding the nailed poles while standing in the puddle as the midst of lightning, I folded the nets and ran. As yesterday, after release the WR did not fly; rather, then, fan 10'-20' and stopped to peen. Piedrots all flew. Just before beginning to clean the nets and band, I walked through Grid 9, 75 m across the road. I did this in the hope that by spooking birds from #9, more would be picked up in the nets. I was impressed by the # of birds already in Grid 9 - despite the fact that I had heard no great quantities flying in. It was too dark to tell well, but there were several flocks (50+ birds / flock) of WR and Piedrot. Remembering 23 December - that birds were flying into Grid 9 at lake ca 2000 - it occurred to me that #9 may be a roosting area. The storm hit just after we left the grid - strong winds + 19mm rain. 1800 returned to Grid area. White rump Yellow LEFT in (G3). No other banded birds detected, although 3 Piedrots were peering, and a small flock of Micropluvia, feeding. Grid 9 - 1830 set up two nets in suspected roosting area. I then retired to the road ~200 m away to watch. Towards dark (19:30) I had spooked one large flock of Piedrots (200+ birds) off of grid while setting up nets. Towards dark (19:30) flocks began to appear - especially WR, Piedrot, and G-Y legs. ~20:05 something spooked a flock of WR + Piedrot that had been peering near the net (10 m away) - they flew up, and some of them in. The clamor of birds caught birds spooked the marsh, and several hundred birds took to the air. I followed the WR + Piedrot flock contained to which in flight proximity of the net, and I picked some up as they went by. During the evening banded 21 Piedrots and 14 WR. 2 WR died in the net.