JPMyes 1973 /1974 Southern lapwing Grid 1 (Farmhouse Puddle) Estancia Medaland, 35 Km S of Juancho by road, Pcia de Bs Aires, Argentina egret and many of the shorbirds present away. 27 December contd Tower Llanos, Estancia Medaland, Ptdo de Madariaga, Pcia de Bs Aires, Argentina 18 January lapwing -> buff-breasted sandpiper aggression. 0735 ~ 200 m E of tower near lowland w/ slight amount of water. 23 January 0700 lapwining -> 4th godwit chasing in 4a. 0730 found SC click foraging in the (0,1), (0,2), (1,1) and (1,2) area of 4b - adult aggression is directed around it, particularly in (0,2) and part of (1,1). 0900 - two ivory gull shorbirds in (0,n) and (1,1) of 4b - 2 pairs adult and 1 chick. At least 5 of the adults are chasing 5 birds !. Not much interaction between pros of lapwings. 0940 - 2 adults flying after Cannaicho coming out of arrays. - Cannaicho flew off see Zonibyx spp accent - lapwing aggressively against Zonibyx. first consistent aggression against other spp. d'have seen by Cannaicho since after chick fledged. there one between subunits 4-5 is consistently going after two local Zonibyx. 1930 - between subunits 5-4 - Cannaicho chasing another Zonibyx. It ignored several roaster WILMPS. [illegible] (5,27) Arroyo Chico, Estancia Medaland, 35 Km S of Juancho by road, Ptdo de Madariaga, Pcia de Bs Aires, Arg. 6 September within past few days (i.e. since yesterday) we have begun to see extensive lapwing aggression directed towards other spp of shorbirds. 0941 today: lapwining across Arroyo in upland short grass (but weedy) habitat chasing smaller shorbirds, most of which are Zonibyx. Baird's + Ch. Falklandicus also fairly chased there in uplands. 0946 chasing again. (0,18) region of Estancia Medaland, 35 Km S of Juancho by road, Ptdo de Madariaga, Pcia de Bs Aires, Arg. -see journal 10 September census of Vanellus and other upland shorbirds 3pm afternoon. What was striking about the Vanellus results was that they were so dense, and that they were almost exclusively in pairs (24 out of 25 birds). @ 1330 - Vanellus chasing Tryngites. 1545 these (lbs) seem consistently chasing Orophelus. I have not been able to locate any incubating individual. 1645 - small group of Vanellus flying off of the field + over road. heading to roost?