J.P. Myers 1994 28 March contd Calidris fuscicollis Puerto Raga, 15 km N of San Clemente del Tuyu by road, Pto de Gral. La Valle, Provincia de Bs. Aires, Argentina This afternoon I've been seeing a new WR walking motion. At first it mislead me, as it is so different from the style in which I am accustomed. I thought that it was a different species. This is a mimicking wading, halting walk: walk, balance on one leg, another step or two, balance again and peck etc. a very difficult rhythm. 1815 - large flash of mixed birds flying up in response to approach of parasitic jaeger. The many foraging WR (previously dispersed) coalesced into 3 or 4 100+ bird flocks + whirled around as the jaeger handled gulls & terns. 1845 - 10 wr and one Agreut working up along channel when. These are territorial birds. Thus, however, are in an analytical flock, moving 150 m while never separating out over an area of more than 15 x 15 meter. 29 March watching landing behavior of WR - how the birds generally cease flapping + glide - not a clean process but one in which % time gliding increased just before landing. At landing the wingspan out, with a quick flutter + tuck after landing. No show. Along the windward side of Puerto Raga at a mixed high-tide roost (see journal 3/28 and 3/29) I collected 5 WR (125-129) Arroyo Chico, Sta. Lucía, Mendoza, 35 km S of Tandil by road, Pto de Medanango, Provincia de Bs. Aires, Argentina grid count + total survey figures indicate an influx of WR into the Arroyo. 6 Banded bird, including ~2 non-territorial ones. See journal. 2 April North of Canal 7 into Laguna Mar Chiquita, 21 km N of Mar Chiquita by road, Pto de Mar Chiquita, Provincia de Bs. Aires, Argentina See journal. An apparent when we came out onto the mudflat that every territorial bird, as I percent heard speaking, saw numerous Sumpulatae, also crouching. ~500 WR near the mouth of the channel - between the mouths of the two Canal 4 channels (downway). In the flock at Lower Channel there is a tremendous amount of aggression. Not all of it territorial. Within the territories we are noticing first appears to be generally located along the edge of a small island just out from shore, + across the channel separating this from a shallower area which runs into shore. Within the 'channel' itself there appear to be more than ten individuals. It may be that borders are located in here. I must admit that in here where the territorial birds are would have to be called patchy. See journal. In the exposed wet mud we find many traces of WR foraging - thick bill prints are everywhere. But predominantly in shallow depressions. 0.25 x 0.25 m. - e.g. old human footprints, old duck lapwing footprints, cracking mud, etc. It is apparent that some of the bill prints are made with an upturned bill. 28