J.P. Myers 1974 Catidvis fuscicollis (11,16), Estancia Medeland, Arroyo Chico, Ruta Pto de Madariaga, Lujia de Bs Aires, Argentina 25 November. su journal, see % TB calculations #6 (made on subunit 3 of the linear grid). 0825 began sampling censusing birds contained on a portion of subunit 3 (sub-sub units 11 → -1. (radius-unit encompasses 5 linear meters of shore (both sides). 0904 there appear to be at least 4 areas which show concentrations of aggression. only one, possibly 2 are space specific. the others are only partially so. see every fifteen hours see aggression plots in % TB data book. very difficult to comprehend now the spatial array on the grid because of the intermediacy of some of the bird's behavior - their inconsistent space-specific suppliants. 0937- it seems clearer now. 2 TB's present - one is 11-25-74t (follows for) took following data, and the other is one which follows so now following, 11-25-74 C (see deiscangrid following data). Both are usually consistent. But both will infrequently leave their territories. Other birds occasionally slow S-S, however, they are not nearly as consistent as A and C. (the latter is especially consistent, supplementing over a distance of 50 m.) The 'A' s consistency seems to be somewhat induced by that in C, i.e. 'A' forages between 3 and 8-9 stakes. C forages + supplements between 9 and 17 stakes. A is frequently supplanted by C and a significant proportion of the supplementation made by A occurs when it is forced out of 8-9, flies back down toward 3, and finds that in its absence encroachers have violated its area. However, I have seen many true supplementations by A, some which were not triggered by C. See plots of aggression in the % TB data book. Wind direction appears to be polarizing the direction of foraging, causing most birds to face + to walk downstream. This causes many of the violations of borders. When A comes to the border with C, it will often continue on, reading 10 before C flies down from 17 to supplement. However, it does not appear now that neighbors upstream from A are territorial (see map following page), until you reach an area ~15 m beyond the upstream end of the grid. NSS aggression does occur in the birds in the upstream part of the grid