JPMayers 1924 Calidris bairdii 40 Km NW of Victoria by road, Pcia de Entre Rios, Argentina 13 August small groups of Baird's flyway along river-swamp system here this morning. Very sporadically, largest group was 5 individuals. One Baird's seen in flock of 25+ Rectorials. They were foraging in a small puddle about 30' from the main water line, with one Tringa flavipes. Flaw calling. See canopy list Estancia Medaland, 35 km S of Juancho by road, Pcia de Bs Aires, Argentina 23 August bairdii on Medaland!! in the Arroyo found first: a pair foraging along subunit 10, then another group of w10. Many small groups along the Arroyo between subunit 10 and the Rte 11 bridge. A few WR mixed in. I believe that I can discern several juveniles by white edges on interscapulars Also found 2 groups (3 and 5, respectively) foraging in upland habitat near Zorihya - almost like little Bufflors. Not only in their flocking call (br-r-r-with rolled tongue) unlike the WR jerk, but their intra-flock noises while foraging are also strikingly different. They all appear to be derivations of the BRM call. Some aggression (nothing obviously space-specific). Total of 76 (perhaps 100?) They were much more numerous than WR's. very skittish. Collected one. (43) Mouth of Canal 7 into laguna Mar Chiquita, 21 Km N of Mar Chiquita by road, Pcia de Bs Aires, Argentina 24 August a few Baird's foraging in a flock of WR + Micropalama along the edge of the humid flat (see map p.66 journal 24 April 1974). Very few calling. Estancia Medaland, 35 Km S of Juancho by road, Pcia de Bs Aires, Argentina 26 August 9 foraging in upland short grass (see journal). all sand-pecking with some bills being thrust into the substrate, but not deeply. Arthur considers vicariously chased a bird's. 31 August 1030 - I stopped to watch one of several solitary Baird's that I have seen this morning along the Arroyo. This was along old subunit 3 of the linear grid (i.e. UTM coordinate system). It is there with a solitary fall landica, both foraging on the W side of the Arroyo. Aside while watching: recall Jorge Rodriguez Mata's suggestion for field ID of Baird's vs fuscicollis - that in f. the spotting is longer + continuous along to the side of the belly beneath the wing, whereas b. does not. I notice here that bairdii has an inverted light V formed between the leading edge of the wing (while on the ground) and the breast buffy