JP Myers 1973 Calidris melanotos 35 km S of Tandil by road 1 km E of Rte 11 on Farmhouse Road, Estancia Meddled, Pcia de Buenos Aires, Argentina 23 November Approximately 15 Pectorals spread along shallow drying pond just to S of dirt road. The birds are well spaced out along the whole length of the pond. When I have been able to spot them briefly see one, they appear to be foraging on small emergent vegetation along the shore. Closest that one is to another ~15". But one is almost amidst a small flock of Yegga and WR. We are too much of a disturbing influence to see what, if anything, is maintaining the spacing pattern (united - even if it is real). The Pectoral gulls (Hydran) wait to fly up on my approach longer than the other species. I can hear them above the wind along the length of the pond. Farmhouse puddle, just W of Farmhouse, Estancia Meddled, 35 km S of Tandil by road Pcia de Buenos Aires, Argentina 24 November Four pectorals visible from road along the puddle. One is definitely defending a territory - chased 2 other birds consistently from an area during the 15 minutes that we worked. Suggestion that another of the birds is territorial also, but only showed aggressive counter which occurred when the first bird chased off an intruder, and the intruder then landed directly on second bird. The intruder was "traveling" with a solitary white rump - the WR was not chased by either of the two birds which appeared territorial. Nor did I see aggressive interaction between a pectoral 50 yds from the road that was feeding near 1/3 still sippers. It could be that the above mentioned intruder was displaced from its feeding area by our presence (as it flew up into the first bird's area when we approached) or it could be that it was moving around anyway. 28 November Rte 11 Pond, Estancia Meddled, 35 km S of Tandil by road, Pcia de B.A., Argentina From on top of the car just east of the pond (above it on the ridge) I can see 4 Pectorals, equal along the pond. All of them are on one particular type of vegetation, a short, broad-leaved fleshy plant that grows in mats along the edge of the pond. One of these mats I remember distinctly from 23 November as having had a solitary Pectoral foraging on it. Arroyo Chico Bridge, Sot Mertland, Pcia de Buenos Aires, Arg. Collected two Pectorals (046 + 049) out of the Arroyo. They were sitting low on the mud near the edge of the water, with several other pectorals, 3 W Phalarop, and several Yegga. One of them (046) had a possible [illegible], although I am not confident in my ability to detect