J.P. Myers 1974 Calidris fuscicollis (10/3) Grid 14, Arroyo Chico, Estancia Meldoland, 35 Km S. of Juanadas by road, Pto de Madariaga, Provincia de Bs. Aires, Argentina 5 November (cont'l) and it looked as if Rolo B was going to ignore them. However, within less than 1 min after its territory was violated the bird broke out of preening and flew from a distance of over 20 m. 1112 - a bird definitely defending 11-74 A's peninsula. [Note - Lois took following data on several birds, including Rolo B. See following data book. Recall that we have following data for this bird on 10-7-74.] Arroyo Chico, Estancia Meldoland, Pto de Madariaga, Provincia de Bs. Aires, Argentina storm producing same conditions as 4 November. (see journal that date) 3 concentrations of WR, ca 4 November. See lineargrid sample. Birds scarce except in three areas. 0940 began watching flock at the uppermost of the areas - (5,23). Aggression very high rates of aggression due, much of it S-S, but it is not clearly so. The area is. [sketch with labels: islands, Walker, shore, a, b, c, 5m] Most of the birds are in Zone 4, which has several other birds in the Arroyo, scarcely heard by the wind. Aggression here is incredible - each bird appears to get into the act several times per minute. I watched several birds for 20 min - one appeared to be at least S-S in foraging with most of its aggression S-S, but perhaps so largely because of S-S foraging. Others were less S-S, but kept in line by the 1st bird + others in vicinity. Many trix-35mm pictures. I then went to the B zone, where birds were much more clearly