JPMyers 1974 19 Catedrii funiculii Linear grid Estancia Medland, 35 km S of Juandro by road Pto de Madariaga, Provincia Buenos Aires, Argentina 20 February ran grid 0520, 1850. See Journal for totals. Resighted RyLyr, RyLyg and RgLg. 24th 21 February rigid Linear grid banded birds at submit 5 of linear grid from 0530-0800 w/ Pablo Caceres, PWR. Gyptian Potrero beyond Linear grid Potrero, Estancia Medland, Pto de Madariaga, Provincia Bs Aires, Argentina. resighted a WR (banded 2/13/74 in tower Nava swamp) RgL O, 0.4 km N of banding site in a small drying pond bordered by black mud, with flock of 5 other WR (see journal for map) Linear grid, Estancia Medland, Pto de Madariaga, Provincia Bs Aires, Argentina. recorded 42 WR on grid while running from 1955 to 2830. then took two samples of banded grid 12 at 2039 and 2049. It is very difficult if not impossible to read bands when the light comes as it does during these hours. Light at the last reading was 16 fc. at 2054 the Slap- wing on the grid 12 started calling, and all but 2 WR flying (2 Chen falc. remained also). 22 February Wind at Grid 12 0640. First bird WR heard at 0641 (they were not in through before this train) Timing is remarkably similar to that of previous days here in campo. (See journal Feb 20, Feb 16) 0911 after - 32 minutes on the grid, during which none of the WR did anything but feed, I am now seeing a few fighting - one WR on linear grid, one WR on grid 12, a Ch. fallax badius on grid 12. Also at the same time I saw the first clear aggressive supplication 0715-0717-0800 data lost because of erased tape. Lois began following data at 0750 (WR 2/22 A sec Linear grid, Grid 12 book, p 19) 0800 Lois watching to 2/22A - went into crouch, staying for 2 minutes 8-12 inches from a bird that had chased it from right (min 30 of following data), 2/22A came out of crouch + began feeding TAIL DOWN. White rump is plainly visible while the tail down. 0804 RyLyr, 2/22A again almost into grid 12, having worked its way up + down the lower reaches of linear grid subunit 5. It seems to be going back and forth. Now it is "running" another WR in front of it (but I'm not sure whether it is territorial or not) - the other bird moves ahead when RyLyr is within 1 m of it. 0809 - finally able to ID banded WR fly 1 side on opposite side of subunit 5 — RyLyr 0810 watching fight between 2/22A and a neighbor - the wramp - the white rump is displayed during the crouch - at least by one bird: wings were lowered off the back and held alongside the wing.