SPMyers 1973 Catitris melanotus Grid 1 (Farmhouse Puddle) Estancia Medeland, 35 Km S of Juancho by road, Pv 27 December (contd) a glance in a fashion such that I believe he had intruded upon the territory of the resident. 1330 comfortably I have confused the two fledged birds while trying to follow a WR at the same time, they are still feeding as before (1330); I have continued to watch the same pair, now in the (0,1)-(0,2) region (one in (0,1), the territorial in (0,2)). While watching them I have been forced to wonder whether or not it is actually a territorial system - but then one is definitely agressing against the other, and he is doing so while staying quite inside of his territory, i.e. between (roadward) the center of the territory. This bird has been moving along, staying between 2+3 m from the other. [Loops - lapsing aggression, both birds clicked very low, one flat against the water] occasionally, as far as 5m away, and now they are moving 3. 2. 1. 1 2 apart. The upper bird is heading back toward the center of its territory. All the behaviours I have seen are consistent with the hypothesis that the upper bird was working the lower one around the territory boundary. Attacks only occurred when there was too frequent passing. 1354 two attack on the 2 birds, first after (0,1) then (0,2). (0,1) flew to (3,1) and (0,2) to (1,5), this is very consistent with the hypothesis that both birds are territorial, as today I'd already determined that (0,2) foraged extensively in the high (0,n)'s and (1,n)'s, and on previous day that a territorial bird with (3,1)-(3,2) as an activity center (and + place for preening etc.) foraged as far east as the low (0,n)'s. The first swoop of the two missed the (0,2) bird because it flanked down on the water. There are 2 more fledged birds that are typically on the grid: one is mostly off, running S from (4,5) and (3,5). The other runs (4,8) and adjacent area just off the grid, running to (5,1), (6,1). These are now (1705)