SP Myers 1974 29 Calidris fuscicollis At Arroyo Chico, Estancia Medland, 35 km S. of Juancho by road, Pte de Madariaga, Pcia de Buenos Aires, Argentina 20 March (contd) the 2 flocks seen banded birds were notably less mixed than the birds in the banded flocks, suggest strongly that these are flocks new to the Arroyo. And when have the majority of banded birds gone? 21 March 0818 began linear grid. made second observation of banded birds early on subunits today. 0829-one in subunit 4 in usual location, on eroded on W side. 0832-Ryloo on territory in sub 5. 0835 a territorial WR in 18 of sub 6. 0837 Rylop about from territory area 3/5, was back + chasing birds off of subunit 4, lower right. 0848 on sub 10 one banded bird remains. Returning along Arroyo searching for banded birds found Rolyo between 10a-19-territorial, chasing off a very large stretch of beach. Rolyo, on sub 9, also territorial (above linear grid /10+). Ryloo was back on its territory. However, by 0930 Rylop, sighted earlier this morning, had left subunit 9 (after subunits 8 & 7), which for over 2 weeks was the foraging area of a large flock, including several banded birds, has now been occupied almost entirely by territorial WR. The birds along here are now very evenly spaced, with ~25 m between them. Watched one WR fly to land 3 separate places, only to be chased out each time. But there are still a few non-territory banded birds. Only 2 non-territorial banded birds, out of 8 banded birds, were found running down this morning. Neither of these (Rylop, Rylyop) used to be found regularly. At 10:30 they were together on sub 3-2. Before, although they have tended to appear on the same day, I didn't necessarily find them together. 1305-just finished linear grid sample. 8 WR! oh great misery! On no subunit were there more than 2 birds, and then only one side. Ryloo was picked up, but it was the only banded bird which I picked up. However, except for one sighting WR picked up in sub 1, the positional off bends were consistent with their being territorial. Moreover, there were no observations to corroborate this though, because no birds were intruding. Mouth of Canal 7, Lagoa Mar Chiguita, 21 km W of Mar Chiguita, Pte de Mar Chiguita, Pcia de Buenos Aires, Argentina gasp. 5000+ WR foraging along the N+W shore of Laguna Mar Chiguita, in less than 1.5 Km of black mudflat. No band (photo). See journal for a description of the area. The flock (or multiple flocks) is largely in a broad shallow mudflat ~750 m W of the mouth of Canal 7, feeding where the strong wind has decided location, pushed the water away (I think). A few hundred