JPMycos 1974 Calidris fuscicollis At Arrayo Chiro, Estancia Medaland, 35 km S of Tucumcari by road, Pric de (Madagascar), Pcia de Bs As, Argentina 31 August (contd) 1125 the birds flew off. I must comment on the general spookiness of these peeps in the Arrayo now. Is this correlated with some migratory behaviour? — an increased tendency to move — or loss of a site tenacity so that thresholds for speeding would be lower? Started taking a new type of data: % of birds which remain within a 10m radius of where they were when I first started to watch them during a 2 min following period. If possible, distance moved will also be measured. This is designed to examine the tendency of the birds to restrict their movements in space, + change place. 1 September at 15:26 taking 'site tenacity' data and observing interactions within core-bird flock twice within the past 10 min. I have seen a white rump begin ~30 cm away, run at a bird’s with no obvious pre-act signal, and bump it with what looks like an extended cheek. The birds then runs away, after regaining its balance — which, by the way, is no mean feat here this morning: I’ve seen several peeps fall and have to fly because they had slipped on the ice (see journal). Took micro-habitat data on a core — it had been foraging through a 2 cm motor hole in a thin (extra thin) sheet of ice. One instance 1135 of a WR bumping another WR. This also entailed a squeak, but I don’t know which one (the attacked or attacker) made the noise. See bandidii apparent. 2 September 1100 observing at 15:26. Flock of 50+ peeps, largely WR. Taking flight site tenacity data. Some have been flying before end of period, but the flights are not 'total' — they involve flying 20 m up or down stream to a point still within the area covered by the flock. They are also flights of individuals, not instances when the entire flock goes up and settles down again. [Frequency of aggression up noticeably.] The 'individual flights' are frequent — not necessarily by a given bird (in fact certainly not) but every minute or so a bird picks up and flies off. This results in a constant re-shuffling of individuals along the 100 m of Arrayo where they are foraging. The total dispersion of the flock is not far from being even over the small stretch in which they are distributed, especially if looked at as an average density in time. But instantaneous clumps occur, 5 or 6 birds concentrated in a 2 m² area, etc. The individual flights shift the position of these concentrations. Birds are also moving on the ground, fairly continuously albeit slowly, on the ground. 3 m/min was the rate I measured.