JPMycus 1978 Barns hyperboreus Atkasook at Meade River, N. Slope Borough, Alaska 26 May (15,36) on Meade grid — even though all lakes are frozen solid and the tundra is >90% snow covered, harus h. are sitting on their nesting sites. Last year 2 presented in the labu by 15,36 on 2 separate islands. Today at 080915 there were 2 pairs, one on each site, and they both reacted strongly to Dave's passing by on TG, almost mobbing him — their typical behavior when we approach during the breeding season (10,35) — another lake basin which last year had 2+ pairs. Today there were 2 individuals perched, one on each nesting site. 27 May (10,35) There are actually 2 pairs here today, both sitting on old nest sites from last year, unwittingly the same birds as last year or how would they recognize the sites as nesting positions? They are frozen solid. ♂+♀ separable by size dimorphism 29 May I checked out one of the sites by 15,36 today. It is an old island — the mosses + grasses have all been torn up. There is a slight depression rimmed with moss, and water filled. 17 June (10,35) — 3 nests active, the 2 I detected plus one other. Eider’s Gulls down here now each have 2 eggs.