JPMyers 1974 Tryngites subroficollis Tower llanos, Salta, Mendoza, 35 km S. of Juancho by road, Prodo de Madariaga, Pucia de Buenos Aires, Argentina 26 February (contd) Accompaniment between today's field data & that of 23 January should reflect the impression that I have today of much greater ratio of movement. 0920 - have been watching a buffle between the grid (10) and the drainage area. It had been perching for 3 minutes when another buffle came into (3.0) of 10, ~7m from 2/26A. 2/26A immediately "chucked" and flew at it. The supplanted bird then flew ~10 m to East and 2/26A followed, clearing further away from area. Days at 2/26A returned toward perching post, gliding through (3.0) of 10, 5m off approach ahead (3.0), its speed increased, + quickly started running at another bird between (3.0) and (3.3) at the stake. Supplementation: 2/26A continued chasing to the middle of (3.0) and then turned around now heading back. This series of supplementation was remarkable for the lack of displays - no wing flashing, nor any tail down. Running was in the face with stretched, slightly off-course manner observed last month. Yesterday (see ap accent) I had the distinct impression that there was a lot of aggression central in the area, where today 2/26A behaving territorially. At 0930 all the local birds flew including 2/26A. Worked until ~30 buffle took off from the vicinity of the tower. Immediately 6 returned, flying into 2/26A's area. Almost immediately upon their return, supplementation started, with one aggressive bird chasing several others. Running with neck stretched. Distance between them at onset of chase was ~5m. I had read (grid) 10 at 0930 - 2 buffle totals. After the Aloe flight (0931) they were gone. And now (0935) five are 5 buffles present, they were "pushed" into the centre of the grid from where they landed by the territorial defence of 2/26A" (which I believe to be 2/26A returned to his territory). 0935 2/26A supplanted again, then flew from a distance of 8 m. 2/26A came up over a little rise in the land, stretched his neck at (surveying its domain?) - continued feeding in same (W) direction, stretched to neck again, "chucked", + flew 5m toward other bird at (3.0) stake. 0940 supplanted from (3.0). Now tolerating a bird in (3.0) within 2ft. But as soon as that bird entered (2.0) it was supplanted. Note: I think that the supplementation previous to this, had 2/26A with an area outside of its territory (1.1) and which it did not defend except in that it continued to chase slightly passed its boundary. Outside of the territory close proximity (2') was tolerated. But a greater distance was not when another bird entered the territory. I am convinced that 2/26A = 2/26A', and that this bird is a territorial bird. I will take feeding data next. One striking difference between it + some of the non-territorial birds is the amount of time that 2/26A devote to looking up.