JPMyers 1974 Tryngites subruficollis Tower Llanos, Estancia Medeland, 35 Km S. of Juancho by road, Attilder Ptdo de Blas Macalaniaga, Pcia. de Buenos Aires, Argentina 23 January cont'd 0820 - briefly fly from grid 4 over grid 10 to past tower. As it flew over (4,4) of 10 the buffy there in (4,4) [which is frequently there in (4,3)] raised its wing + waved for a second or two. During the 0925 reading one buffy was chased by 4 consecutive birds on grid 10. Border fight between birds in (4,3) and (4,4) induced by the presence of the chased bird - 0926 border fight in (2,0) between K and L - (bird L has been following - Grid 10 book p5). Very intense fighting lasting 10 seconds then separated by 2-3 m and out for 2 minutes. Heads alternated between heads normal + heads tucked. Then L got up, began mock fording, started away but then jumped at K. Hopping fight for 5 sec then separated by same distance as before, went into crouch, remained as such for <1 min, then L flew over into (3,0). Lois this morning has followed 6 birds so far. (see pp 1-5 of Grid book 10). First flew after 10 minutes, second after 11,78 (fornorth of there 2 are counts of agg. available) 3rd left after 30 min - (in that time it chased others 6 times while taking flight) was never itself chased by buffy, but yes by golden (I) and S. lapwing (I) 4th left after 15 minutes: chased others 4 times, left when it was chased by buffy (2nd such event) chased 2 by Golden. 5th bird followed for 3 minutes, during which it chased other buffy once, but left when all birds took flight. 6th bird remained full sample period (one hour). During that time, it (4) was chased 3 times, and chased others 7 times. Activity strongly centered in (1,1), (2,1), (3,1) (3,1). Defended larger area - as far as (4,2) 11 units (~275 m2). Has a border with K (above) in (1,1), (2,3) (2,1) region. 0945 - I think that we are discovering that there is discrimination within between neighbors and non-neighbors by territorial buffy. During the 0940 #10 sample there were 2 buffies in (3,4), both preening one was K,