5 Pillagers 1971 Calidris melanotos 03 10 January cont'd Rte 11 Pond at Farnhouse Rd, Estancia Medland, 35 km S. of Trencho by road, Ptdo de Madariaga, Provincia Bs. Aires, Argentine Birds were preening. I suspect that at least two of them had applied from other territories nearer to where I parked the car. Anyway - when the chasing bird followed the chased across the road, we were left with only 2 preening birds, both over a 1' rise + several feet from the edge of the shore. A short time later, they flew off. Then, in 15 minutes a Peck flying, began fraction + interlacing with the WR. 1630 another Peck flew in during the first one was in the E' most reach of the spit, + I could see it regard to the landing bird's noises (which landed N 5 m W of the mouth). The first (A) flew over, as it flew the other retreated slightly, approaching the car a bit more. B then stayed crouching perpendicular to A, + the supplementary which had expected did not ensue. Instead, a bout of display, ending with A returning to its stretching and B feeding along the edge of the pond beside the car. The displays entailed head bobbing, neck stretching, crouching, back feather ruffling. Quick bursts of feeding were interspersed. The original approach by A was helicopter flight. 1635 - both birds flew down (N) the pond ~ 50 m. then I lost B, but A landed down flat, + then began working fairly rapidly back S along the E side of the pond. 1638 he was preening, when another Peck appeared (it was supplanted in turn by A). A then returned to spit. This was followed by 2 other Pecks flying by + cheering. As they flew in, A emitted a new sound (i.e. one I hadn't heard in Pecks before) - instead of a churr it was more staccato, about 2 sec-3 sec in duration, several times repeated. Both birds landed on the territory, A flew away to upper reaches of spit; stood there with neck stretched for 30 sec. A then flew at neck of the intertorors, which flew (the other followed). The first of these flew down (B) to a spot where A had flown before. The other followed, landed, + was chased by the first one. Just after this, I thought it off, chasing A made the first chase, involving churning, the chased bird flew over B, and was again greeted by the staccato call. Finally, after the disappearance of the other two, A started hounding the territorial WR ("A") - c/asing him for 3 or 4 sec. 1645 collected A (065) - a juvenile male (borsa). Tower House, Estancia Medland, Ptdo de Madariaga, Provincia Bs. Aires, Argentine 18 January 22 Red-breasted Plovers in multi-species aggregation noted on Homaio in 1st 185% Now are feeding (8 preening, 14 rioting). By 1920 they had been swept depleted by a herd of sheep. Not found again.