J P Myers 1974 Calidris bairdii Estancia Medaland, 35 km S. of Juanildo by road, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 31 August (coritd) [illegible] oh well buffy zone inverted V in baird's. lighter than surrounding area an extension of the white belly + lower breast In WR this [illegible] lighter area, usually white-white grey, is absent or mottled with dark grey spots. Of course, the distinction is not perfect; baird's sometimes are almost filled in, and sometimes the WR pattern is reduced to a few spots. This time of year the difference in winter plumage - WR a dull uniform grey in contrast to the baird's scalloped buffy back + definite buffy fringe to the breast also helps. Very few birds are not immediately identifiable using these features.] 5 minutes after I began watching a flock of 3 fall landiuns and 2 bairdii flew in. [I thought the fall landiuns already present gave cheer to its conspecifics (albeit inconsistently) the baird's showed no reaction. Within 3 minutes, the 'new' bairdii was within 5 m of the 'old' one, and it then passed at less than 6" from the original bird. At that pt. a 3rd bairdii landed where the 2nd had again eliciting no response. Eventually the 2nd bairdii continued on, while the 3rd came up to the 1st and began feeding by it. They remained flat away till I left, in about 5 min. Thus this bairdii is not territorial here + now 1 September 18:00 at (15.26) along the Arroyo [illegible] 6 bairdii among 19 peeps; remainder WR. Some agapanthus apparent this morning. Twice within last 10 minutes I have seen a baird's bumped by a WR. The White-collared Plover seems to be WR or accent. Baird's not talking very much in comparison to the infrequent WR chatter. More bairdii 30 m upstream. There appears to be some cohesion to their flocks - i.e., they stick together. 6 more bairdii together in the group 30 m upstream (no WR). Solitary baird's present along the lower stretch head of Río habitat (10,15), Arroyo Chico, Estancia Medaland, 35 km S. of Juanildo by road, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 5 September 6:30 possible tintinabul baird's at the curve. calling and chasing other bairdii in a not strictly PS basis. appears to be limiting its activities to the is just upstream from the tightest one on the curve