J P Muggs 1974 Charadrius falklandicus Arroyo Chico, Estancia Medland, 35 Km S. of Sanandres by road, Pto de Madariaga, Provincia de Buenos Aires Argentina 23 February There are notes on this species prior to this date within the journal. 0803 landed Ch.falklandicus in Arroyo, visible from tower - Left Green in unit 1 of subunit 1B of the linear grid. This bird was landed 23 February on subunit 5 of the linear grid. 26 February 0807 - Lgreen again on opposite side of Arroyo by tower. 1045 R in unit 12 still, as in Lp. Rg on linear grid subunit #5. 1050 Lp between subunits 5 and 4.5 minutes later. Ly on subunit 2 27 February 0749 - Lgreen on opposite side of Arroyo by tower 29 March for a period of resighting of landed falklandicus see resighting chart. Punta Raga, 15 Km N of San Clemente del Tuyu by road, Pto de Gaul, La Valle, Provincia de Buenos Aires, Argentina 28 March 0945 - falklandicus already on beach above high tide line to low tide line (it is low tide) near camp. Foraging solitarily. 0850 - on the cliff at Punta Raga - many falklandicus all along tidal mud flat. They appear to forage out as far as fusiscallus, but also up beyond the high tide line. 22 April Arroyo Chico, Estancia Medland, 35 Km S. of Sanandres by road, Pto de Madariaga, Provincia de Buenos Aires Argentina Since 15 January I have landed 14 falklandicus. Today I resighted 7 of those (4 landed between 1/15 and 2/23, 04/1984) (See hand schedule + resighting charts) of these 4, 3 I know are territorial, and 2 are already invariably seen on these territories. There has been no recent alerting of Ch.falk territorial encounters, nor any sign of flocking, and I have seen in C. fusiscallus along the Arroyo. Between subunits 8 & 7, where I usually see a large # of Ch.f., disproportionate to the totals seen along the Arroyo, there is a large expanse - a delta - created by a drainage ditch which flows into the Arroyo at this point. The Chifalk spread out from their usual foraging site along the edge to forage well away from the water on the flat open sandy delta. One bird here by lo may be territorial in the delta. 1108 Since beginning to take following data on a CWR between subunits 4 and 5 45 minutes ago, I have seen 3 border fights between