J P Pligers 1977 Calidris melanotos At Kasook, Wildlife Meade River, N. Slope Borough, Alaska 4 June (cont'd) 8" shooting, groove displaying (at all levels of curiosity from simple vocalization to entire shrilling w/ rolling groove call). But 9" continue to fly by to NE. In fact today I saw a number (>50 9" in separate flocks of 5-15) even during the day. A Hyp: these 9" are looking for concentration of 8". The 8" spend a lot of energy chasing few 9" flocks when they move by, flying up at them, shooting in chases (flight + finally wheeling back to their territory. Could this be the way that opportunism is expected? - go to a place w/ many 8"? I am struck by the similarity in movement between melanotos and Stercorarius pomarinus (see journal 4 June), Pictorial habitat: 8" almost everywhere, including along ridges. 9" more restricted, mainly in areas comparable to Barrow. 5 June 9" must have chitter by now in many places. Activity down. Several 9" screeching tail up [lay-off] display to 8". Also acting as if they have a metallic nest (typical alarm chirr). 6 June Dave Best (camp manager) showed me a complete melanotos clutch behind the labs. He found it yesterday. NARL, Barrow, Alaska 7 June on GRISITE. Aaah! only 3 8" in area. One pellet hood. Perhaps 9 9". Shetford + Erickson report few melanotos in Barrow area, At Karaoke, Meade River, Barrow AK 9 June shooting + other display activity much diminished save in the lowest areas. Along ridges and in earlier melting sites 8" are conspicuously absent. Poux string (loop) and lakeside margins are now their most prevalent display sites. Also observing obvious 9-9 aggression such as I observed last summer w/ 9" w/ broods. Simple chases, supplantations, from around nest area, Barrow. 12 June Jeepers. This am. tracked a melanotos with the largest territory I've ever seen in a pictorial. Tracking data did not include entire territory I think because no swooped out at all