JP Myers 1973 Calidris melanotos 35 km S of Tandil by road 1 km E of Rt 11 on Farmhouse Road, Estancia Medland, Pcia de Buenos Aires, Argentina 23 November Approximately, 15 Pectorals spaced 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 as they see me, they appear to be foraging on small emergent vegetation and along the shore. Closest that one is to another ~15". But one is almost a midst a small flock of Vegar and WR. We are too much of a disturbing influence to see what, if anything, is maintaining the spacing pattern (in fact - even if it is real). The Pectorals speak less (fly higher than) wait to fly over my approach longer) than the other species. I can hear them above the wind along the length of the pond. Farmhouse puddle, just West farmhouse, Estancia Medland, 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 (nonhuman area) during the 15 minutes that we watched. Suggested that another of the birds is territorial also, but only observed an aggressive encounter which occurred when the first bird chased off an intruder, and the intruder then landed nearby to second bird. The intruder was "traveling" with a solitary whiterun - the WR was not chased by either of the two birds which appeared territorial. No birds observed aggressive interaction between a Pectoral 50 yds from the road that was feeding near 13 still sparrows. 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 Rt 11 Pond, Estancia Medland, @ 35 km S of Tandil by road, Pcia de B.A., Argentina From on top of the car just east of the pond (almost at the ridge) I can see 4 Pectorals, spaced 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, Est. Medland, Pcia de Buenos Aires, Arg. Collected two Pectorals (046 + 049) out of the Arroyo. They were sitting down on the road near the edge of the water, with several other Pectorals, 3 W. Philomachus, and several Vegar. One of them (046) had a possible [illegible], although darn not get confident in ability to tell.