JPMayers 1974 Calidris fuscicollis Arroyo Chico, Estancia Medland, 35 km S. of Tandil by road, Ptdo de Madariaga, Provincia de Buenos Aires, Argentina 14 March could 1100 - collated (OR) from subunit 4 - a filler feeder, and non-territorial. Immediately weighed + injected with preserved alcohol, including down esophagus in order to preserve contents. Collected some of the mud upon which it was feeding. 1120 collated (WR) (114) from subunit 1 - a stand pisher. Returned to camp. This afternoon I have taken stomach contents + preserved in alcohol. Will examine when there is proper light. 16 March Linear grid sample down to 25 birds. No territorial relationships in subunits 1, 2, or 9. In 3, there may be, but I don't know. Picked up territory boundary on 4 on the W side, and in 8, on the west side in 1 (across from 13). Thus, knowing that in 5, 6, 7 and 10 there are territorial birds, I have yet to find out about 3. 1100 walked along Arroyo (1) from end of linear grid to Rk 11, ~5 km away (see journal). 3 banded birds: RyLgr, RyLro, RyLo. The second bird has a territory just on the N side of the fence beyond subunit 10. RyLgr was with a flock of 20 other WR about 300 m beyond this fence. RyLo was with 7 other WR in a flock at the drainage ditch by ~4.5 km W along the Arroyo. I found 54 WR along the entire route, ~40 in thin V pin of the end of the linear grid, and the rest in the vicinity of subunit 1 found RyLo. A few were scattered between, but most of them I picked up in flight. I should note that RyLo was last seen 2/23/74 in a drying pond ~4 km NE of the lower llano swamp. 1 km E of Farmhouse by road, Estancia Medland, Ptdo de Madariaga, Provincia de Buenos Aires, Argentina RyLgr is foraging with a flock of 19 other WR in the swamp just to the S of the road. Arroyo Chico, Estancia Medland, Ptdo de Madariaga, Provincia de Bs.Aires, Argentina 20 March See journal. WR #’s in sample on linear grid down apparently. Only (6 banded birds) (4 territorial). 2 additional banded birds found in Arroyo above the linear grid, ~500 m to the N. At 1530 RyLao was between units 8 and 7 in a flock of WR filter feeding. This is the first time I have found this bird away from its territory on subunit 3. However, two other territorial birds, Polaoyo and RyLpr were on their territories. I found 2 banded birds 500 m W of the linear grid. WR activity is definitely increasing in that stretch of the Arroyo. The fact that there were only 2 banded birds N of the fence above the linear grid, and that these birds were within one flock, plus the fact that [illegible]