JPMYAS 1973 1974 03/01 Microplana himantopus Grid 1 (Farmhouse Puddle) Estancia Medeland, 35 Km S of Juancho by road, Provincia de Bs Aires, Argentina not allowing other Micro's to approach within 2ft of him. Field observations. But it is not solely a distance phenomenon, as the absolute rather than relative spatial position of the attacked birds appears to be the determining factor. This is in great contrast to individuals that are foraging in the nearby flock, moving randomly with respect to one another, their positions in space clear, without any significant aggression, and certainly without the vocalization of this individual. Actually within the flock there are other birds behaving similarly, but they are quite different in behavior from the flocking birds. Mouth of Canal 7 into Laguna Mar Chiquita, 21 Km N of Mar Chiquita by road, Ptebo de Mar Chiquita, Provincia de Buenos Aires, Argentina 8 March just because they haven't been on Medeland for the fact several months does not mean that Microplana himantopus disappeared from Argentina. Found 30+ there this morning, collected 2 (106,107). Both 07juv, very heavy fat, just beginning to come out of basic plumage. 21 March several hundred Micro's in flock of 5000+ WR, foraging about 750 m N of the mouth of canal 7. Tower Llanos Swamp, Estancia Medeland, 35 Km S. of Juancho by road, Ptebo de Mada - riaga, Provincia de Buenos Aires, Argentina 24 March 15 Micro's in the swamp foraging in 2 small groups along with WR's. All they were largely commuted. Mouth of Canal 7 into Laguna Mar Chiquita, 21 Km N of Mar Chiquita by road, Ptebo de Mar Chiquita, Provincia de Bs Aires, Argentina 28 August 15 Microplana foraging in typical tight flock (at times all within 1m radius of one another) along the edge of the mud flat (see map p66). Most are in winter plumage, in a few a hint of the breast pattern remains. One has an absolutely mottled foot. See journal 23 August for water condition on Medeland.