J.P. Myers 1979 Calidris fuscicollis Arroyo Chico, Estancia Medellin 35 km S of Juancho by road, Ptd de Madariaga, Pcia de Buenos Aires, Argentina 12 March, (cont'd) the month, in which the latter, Ry Lop, and flocking birds foraged on occasion. The bird To the W defended from 1 or 0 on North, leaving at least 15 m @ unconflicted. Another item: Ry Lop follows a very consistent pattern, going clockwise from across from 5, to across from 12, E over the Arroyo (5 m) to 13, then back to 7, across over the arroyo down to 6, to 1145 - Ry Loo back on territory. 13 March grid count 0813-0846. 31 total (wrump) seen, with 20 on West side. The east/west ratio has been gradually slipping to the favor of W. 0832 border fight between 2 territorial (wr) in subunit 6 on the right hand end of Our West side. 0840 - 3 WR agreeing in subunit 8. 0904 Ry Loo again on territory above subunit 70, just W of the fence. 1010 began following Ry Loo on territory on subunit 5, where I had last followed this bird 3/7/74. See linear grid following in book #2. Except for a 4 min period Ry Loo was always on the W side of subunit 5. It disappeared for a 4 min period - whether visiting an unidentifiable point, or whether it left the grid I don't know, although I suspect the former. Ry Loo fed (in/out) almost the entire period, supporting only 7 tissues. I checked a border to the South W 5 m beyond the 200W stake. Northern border just south (<3m) of 100 ON side, the territory was ~1000 m long. No feeding on E side, nor any supplanting. But during the 60 minute sample period no WR foraged on the E side. Ry Loo's feeding activity was fairly clearly dispersed along the whole length of the territory, descent in 14,15,16 and 17 was. The only striking difference between today's behavior and that of 3/7 was the extension of the foraging effort on lar as OW, and the absence of E side foraging. Consequently, less aggressive interactions. The latter two may have been related. On 3/7 the only times Ry Loo ventured onto the E side were during or following aggressive interaction. 1645 back in Arroyo. Few sightings further below (see subunit 4, most of the birds being in groups) for resting. Although I have not commented on this to date, I have been noticing two very distinct feeding methods employed by WR in the Arroyo. One is a search - peck at index, involving a lot of movement. The term "search-peck" may be a misnomer, as perhaps it is peck-search, i.e. the pecks are an integral part of the search. When foraging - the WR runs a few paces, and pokes its bill gently with shelly-like the sand, once or several times. These probes would appear to be oriented towards discontinuities in the sand - frequently the bill is jutted into the base of mounds with heaps of mud etc. But I will also enter into smoother areas. Traces of this feeding style are quite obvious: the bird leaves not only its footprints - a meandering path - but also many bill prints. Often a 4-probe pattern is seen: : : : : the probes are shallow,