B. Hamilton 1965 Calidris pusillus June 12 Barrow Alaska - These birds were first observed feeding and displaying in the areas of ARL. A flight display was seen in which the bird uttered a trilling note. This trill was also given on the ground. The majority of birds seen were in the area W of Family Lagoon. All of these birds seemed to be paired and some chasing seemed to be occurring at territorial boundaries. June 13 The numbers of semipalmated sandpipers S at ARL seem to have increased and the birds seem paired. In the area visited W of Family Lagoon the number of pairs also seem to have increased. Much trilling was observed. June 14 Several Semipalmated Sandpipers were observed feeding in the Bath Area. Observations were made on them three of them and they were collected, when upset they gave a little trilling call. June 16 One pair was observed N of Wolfschlag Slough. No Courtship activity was observed. June 17 The trill of this species was heard only a couple of times. They were observed feeding often. They seem to be paired, one of these birds was chased by a White-rumped Sandpiper three times. The last time it flew to another area. June 18 About 3 pairs were seen in the Bartel Area. They were seen most often in aerial display. There seemed to have been several boundary disputes. June 19 About 20 pairs were observed singing and displaying around the tundra.