J.P. Myers 1974 Calidris fuscicollis Grid 14, Arroyo Chico (1915), Estancia Medaland, 35 km S. of Jramdio by road, Pib. de Mardingo, Provi. de Bs As., Argentina 4 November (cont'd) at all like the directional flashes which were characteristic in August and September (see ap. accent) the genus seems to be to take a site and keep others off of it. But they are still those which appear to lack the tenacity of others - a continuum. 1974. 5 November beginning % TB calculated at 0800. 0807 - not as many birds here this am as last evening. Looked ~ 5, including Rolo B which is prob. territorial, so appeared to be last evening. Rolo B suppliying from large area and is no longer bounded on south by [illegible]. There are no [illegible] in grid. It appears as if the territory is expanding, of Rolo B definitely, even the morning series observations began. 0810. 11-5-74A is also expanding (from a territory incured, 5 of Rolo B on the peninsula (see % for bird data book). 0846 - and then WE try to wedge in between stand Rolo B? - it's been forced out now (0852) + going to island just to south. Water level decreasing, exposing this island in (61) and (11) substrates. 'Peninsula also growing'. 0903 - obvious from watching border interactions between 11-5-74A and Rolo B that the ter- ritorial borders show some flux. Is it still evolving (i.e. expanding system)? Border positions not as fixed as some that I have seen previously. 0954 - a rabbit came by. All space-specific aggression ceased, including that of Rolo B and 11-5-74A (there is one other territorial bird). How screwy. 0952 - still no supplanting birds moving in. 0959 - Rolo B just began chasing again. 1005 - large disturbance by horses. All birds except Rolo B, which crowded in hiding by the (61) stake. Now proceeding. 1040 only now Rolo B (since 1005) has been only ten bird present and defending. It looks as if A banded bird, or at least there are hints of 5-5 aggression in its territory. Crowding with Rolo B. 1048 they flew again - all except Rolo B. 1157 - only ten bird present still Rolo B. A few we are making their way back into the area, [illegible] What appears to have happened during the morning is that ~ up to 3 territories were in the grid but only one was well established - the others were definitely defended for some time but their defenders left the area quite readily if spooked, and took their time in getting back. 1101 - stopped cursing, [illegible] [illegible] [illegible] Rolo had gone off trailing up beach ~75 m to peen behind copse. A small flock moved in