J.P. Myers 1974 Journal Grid 15, (0.18) region, Estancia Medaland, 35 km S. of Juandolo by road, Pteo de Madariaga, Rcia de Bs. Aires, Argentina for the first time, this morning we saw significant #s of Tryngites and Pluvialis continuing on in flight westward over the road into a newly finished, plowed field. Another words, there are areas to descent the 1.18 region for. I did not however that I was seeing many more nests of Sumpulatania lay Tryngites on Grid 15 this morning, suggesting that %T bird is up. Three 3 things are possible, it would seem: 1) That the increased incidence of Sumpulatania bears no relation to reduction in density of Tryngites; 2) That it is the cause of it, and 3) That it is the result of it. I suspect that if anything it is both a cause and a result. Rain 30 mm during the night Tower Grids, (1.18) region, Estancia Medaland, Pteo de Madariaga, Rcia de Bs. Aires, Argentina 0600 → 1820 in tower taking buffle grid data. Weather at dawn 12°C, low 100% clouds inland fog, moderate southerly. See Tryngites sp accent for running communication events on grid 17b. It was a very long day with weather conditions essentially constant throughout. (Grid totals (on 17b): average range total Tryngites subruficollis 10.8 (5-24) 527; Pluvialis dominica 5.2 (0-24) 245. Three totals represent only those sample taken at the regular 15 min intervals. In addition, there are 2 samples of spooled buffles (buffle only) with 12 and 26 birds on them on the grid. The general picture of the Tryngites situation today can be summarized: a solid core of 5-108 constantly territorial birds with territories either completely, or on partially on 17b, plus a group of ~5 which showed considerable over space specificity in aggression and foraging, more in mid and late morning and early afternoon than in early morning or late afternoon. The calculation of (Mx)6 showed fluctuations in time unit has in the past. Running commentary (see Tryngites sp accent), plus recording of all instances, instances of buffle acquisition from 0615 - 1500 suggests that the peaks in (Mx)6 are spontaneously occurred, but sometimes not, and that peaks are quickly reduced via an increase in acquisition. See grid 17b data book, for (Mx)6 data and aggression material. We also have Pluvialis and Tryngites following data from tower area grids, as well as buffle picking data. See Grid 16 data book. Arroyo Chico, Estancia Medaland, Pteo de Madariaga, Rcia de Bs. Aires. 13 November 0701 began reading the linear grid. This morning the weather which (began the 10th