J.P. Myers 1974 Journal Grid 14 area, (0,13) Arroyo Chico, Estancia Medaland, 35 km S of Truncado by road, Pto de Wladarising, Pria & B.S. Aires many others, Ro+BrB defending an area on grid 14. However, there are also non-ss individuals. We (Cass + E) remained at Whitfield Grid 14 until 1800, taking samples and following data: (average) (Grid total of 8 samples) White-rump sandpiper - 18 (15-23) 144; Micropalama - (0-1); Brown yellowlegs 0.35 (0-2) 3; Black-necked stilt - (0-1). White rumps showed dispersion values of 0.8 - 1.6 with an average of 1.18. Territorial, in the process of formation obviously, were quite small, usually only a 3-4 m stretch of shoreclear. Both old and new plumage types were engaged in both ss and non-ss behavior. During the sampling period the habitat continued to fill up as water rose. 5 November. We had intended today to test make a % ten. buffy calculation on a grid we had placed last evening. But a non-starting car prevented us from getting to the site on time. Therefore we returned to the Grid 14 area and in order to run a % ten. We carried Calculation stuff. Began censusing at 0800 and at the same time I began recording time, location and topography of aggression on the grid (we limited observations to that season units (1,n) -> (3,n)). Lois took following data on several birds including Ro+BrB which was here again this morning. Observations continued until 1100. We then began taking habitat measurements, doing so for the remainder of the day. The usage pattern on the grid had changed somewhat from yesterday - a large drop in CR density. Water level has dropped considerably also, but not so far as it did last night (see journal). At the beginning of the observation period there was a slight Swirl, and temperature was ~5°C. Both increased during the day, temps reaching 25°C and the wind becoming moderate. No clouds. During the observation period a maximum of 3 km/h wind birds, one being Ro+BrB were in the area. Calculations (mean % of 10 censuses) revealed a % territorial bird value = 43.7%; ranging from 17 - 100%. The other two territorial birds were not banded, and did not always remain on the grid. As a result, I counted them as territorial only if they had been behaving in space- specifically whenever a bird entered their territories during the previous 10 minutes.