JPMijers 1974 White-rump Sandpiper 1Km W. of Farmhouse on Farmhouse Rd, Estancia Medland, 35 Km S. of Juancho by road, Ptdo de Madariaga, Proin de Bs As, Argentina 15 January cont'd appears to behave rather than some out-of-racket sex. I must catch completely several times. 1730 - old territory of A cleaned out considerably, only 5 birds now, more evenly spaced within the area than before. 3 in the center pond, one on the west end (bear watching him, Z, for 20 min now - he is definitely traditional) and one on E. end, which appears to be ten, as well. I have seen numerous space- defined supplementation by Z. Z appears to be pushing his territory E. gradually - undertaking though that the supplementation by Z near border begin with a vocal + phsy. change - a crouched run with head down, lots of quacking (classic wr turn cell). But on the border he storms abruptly + goes into a brief cloud - facing the opposite wind. 181735 - pair of birds between W + Z, oddly quite difficult from others - feeding close together, moving along, do not appear to be aggressing whatsoever. But they may have just landed, or.... But they look very different in behavior. 1740 - Z has a drop of beach in form of U E defined as a territory. Z is following Y: separated from X but still close. Also appears to be feeding differently: much daintier - surface or near the surface pick. Accent shed head in 1/2 once (though in both A + Z, and others present now, that is the main style). Feeding on above. It is moving to W. Edward it, then it entered gauntlet of territorial birds W of Z. Stopped to peck + battle. 1745 feeding with B in a more "normal" fashion. 1750 I collected Z, (all marked [071, jun 07]), but missed X - despite the fact that the flock remained to give me a second shot. Tower Llanos, Estancia Medland, Ptdo de Madariaga, Proin de Bs As, Argentina 17 January chased cows away from tower at 0615. Within 15 minutes a mixed flock of WR + (truffi) moved into area where the cows had been, particularly in small drainage S of tower + on edge of Llanos on both sides. WR as well as truffi feeding from exurpies. ~10 WR including 2 banded birds: [illegible] x yellow 1. green banded 1 January Grid 9 - feeding in drainage + on Llanos Nof drainage; (yellow- banded 30 December Grid 1!) - in Arroyo. Dependence of WR on cows pies in the Llanos foraging area is striking? They are only in the areas where cows were last night, then flushed with cowdust if they come from pido