Calidris pusilla 30 June. Moose River Coal Mine, 157°25'W, 70°29'N, Alaska. Lapland longspurs feeding together; they flew to a small isolated area and began to feed. In all cases the birds were closely flopped, even though they seem to be local breeding birds. I suspect the very low territoriality of the late season, which seemed to be the case last year at Baurus, allows birds to take advantage of the local concentration of food supply when it is abundant at mid-season, but the stricter territoriality of the early season is an adaptation to space the population early in the season when food is scarce. 1 July Most of the birds seen were in the flatter flats area, and they were not very active. No feeding or scolding. Two were working the river edge and a large clump in the willows. No one the lines above the flats. 3 July All the nests on the census plot ok. There was little activity North of the plot as on earlier day. One of the two nests had piped eggs. Birds spend more time at nects than they did earlier, and often fresh when I am gulls far from the nest. 4 July A small group - 3-4 - on the Curricularia-Cetaria flats where they had been before, apparently still chasing mosquitoes. There were several other flying about in the area. On the lake there were scattered birds plus groups of 3 and 4 on the sphagnum dypso, where they feed mostly well up on the dypso. They were much more suspicious than usual.