J.R. Myers 1974 Calidris fuscicollis 4 November [illegible] Arrayo Chico, Estancia Medaland, 35 km S. of Trancoso by road, Pto de Medaniana, Pto de B.S. 50 journal re today's sample. We drove all the way off the Arrayo to (24.32) in search of birds We 1 to see whatever. 1040 at (24.32) we found a [illegible] flock ~20 we spied along the drainage ditch while [illegible] to the arrayo from the B. Observation quickly revealed that the majority of birds were behaving [illegible] in a space-specific fashion. I collected one (171). Shortly thereafter I found Rylgy, a bird [illegible] I'd not seen since 9/21/74. It too was behaving [illegible] 1215 at subunit 1* of the linear grid; on closer examination of the birds foraging here it appeared that there are 2 plumage types: one is the typical more-gray winter plumage that the Medaland birds have been in for some time now, the other is a much darker plumage, almost like a Baird's and even brownish. But the feathers here are mottled with white, particularly the wing and scapular coverts. I strongly suspect that they are juveniles. They represent a major influx into the area, as there, noted on subunit 3 are ~110 w/w, 80-90% of which have the 'juvenile' type. Otherwise they are also obviously in possession of a portion of their breeding plumage. In this flock a great % of the s-s aggressors (and also m.s.-s) is by these birds (for you might expect from just sheer numbers). Very aggressive. Much energy. Are juveniles excessively energetic? (Grid 14, Arrayo Chico (10,13), Estancia Medaland, 35 km S of Trancoso by road, Pto de Medaniana, Pto de B.S. Buceros late, Aquilata Sampling grid 14 from 1635 →. Lois taking following data. @ 17:05 I began to help her follow a gray bird (one individual which we select) because it appeared to be near [illegible]. It is 11-4-74 A. began (S.1) subunit where it has been crouching part in this a feeding position, picking things off of the surface. Not sure yet whether it is s-s. The majority of us here thus a [illegible] are incredibly ag- gressive, much appearing s-s but also some intermediate forms. 11-4-74 A feeds in the crouch, peering at the surface, and then periodically (~every 2 min) runs off to the water (a ~30cm away), shells there for 5-10 sec, and then runs back to its foraging site. Does not appear to be carrying anything to its D. Not a quarter of it working slowly forward water: 11-4-74 A abruptly breaks off feeding, runs direct. Very 'intense' behavior. Most of them facing into wind, not preventing others from entering into area when it has been foraging. NON S-S. Re peeling