J.P. Myers 1974 Tryngite subruficollis Tower Hvos, Estancia Medaland, 35 km S. of Juancho by road, Ptdo de Madariaga, Provincia de Bs. Aires, Argentina 17 November (continued) Stalking at insects, usually 2-4 cm above the ground (and therefore near the tops of the grass blades). I noted 2 things about this behavior - 1st - it appeared to become less frequent as the afternoon wore on. By late evening all the birds were doing the classic search peck for which I have good descriptions from last year. Second, when I saw this stalking behavior, the accompanying run in between stubs, birds seemed to be more spaced out. They appeared to move faster, and with less coordination between individuals - indeed if anything there was little resemblance to directional or static flocking. Also distance of aggression of a run - ss appeared larger, or perhaps there was more s-s aggression. Anyway, the style of foraging looked as if it was having an effect upon the spacing. This impression was emphasized when as the afternoon went on I began to see more search-pecking and more directional flocking. ¿Quirinale? [Reflection - it occurs to me that the consistent early roosting of buffiis (~20 min before sunset is period of peak movement) may function to allow the birds to locate the shifting roost site. Certainly more than any other bird, they roost early, and they shift their site. They also feed in the roost area. They also whirl over the general road area more than all other species.] Grid 17B, Tower, (19) region, Estancia Medaland, Ptdo de Madariaga, Provincia de Bs. Aires, Arg. 20 November See journal. Sampling 17B since 0730. Lois + I talking sits of aggression from inward data books. 0757 - birds flew c-d land again. Today we are trying to catch all forms of interaction + therefore maybe somewhat more inclusive than data for e.g., just now - 0801, a bird flew from 0.1 to 0.0, ~20m towards another bird. The flight was helicopter style. The other bird then took off less than 20 sec after the 1st one, and flew approx. the same distance directly away from the supplementary bird. [NOTE - for a period in rush hour marrying note could not be transcribed because of tape-recorder failure]. 0930 - first s peak of the morning - 3 separate flights in by then 4 minutes. At the same time a swainson's hawk was flying overhead -