J Pluigers 1975 Calidris alba Britton Area, 1 km W of NARE, Barrow Alaska 9 June 07:55. ch semipalmatus ran at a sandplover which had been behaving territorially. I began watching the sandplover. promptly began display. call similar to dunlin ~ board but lower, less musical creak rrrrr . . . """""""" . . . each of the notes rises slightly + is composed of distinct ticka (slight rr sound to it) - rrrr, rrr, rrr ~ 1.3/sec) It gave this call from the ground several times. much sign of aggression running around chasing semipalm sandpiper. [sketch of bird with note: heavily ruffled back feathers, calls] then flew up in display flight, rising ~10 m, fluffing similarly to semipalm calling air process. appears as if the prominent white wing bar is visible from bottom while bird in flight. Three in another sandplover in immediate vicinity, feeding along shoulder ~10 m away. Their whole area is a gravelly pond with several transverse lines of gravel ridges ~ 10" high, varying width, w/ some sedge on surface. 8 calling from top of ridge, bulging the neck out rrr rrr rrr . ENTERED NEST CUP (!!) deep bowl facing toward me, creaking. rising tail - but not as shifty as semipalm. back feathers also erected. [sketch of bird in flight with notes: tail not fanned, neck stretched out, little rotation if any, head lower actually than shown here, below level of tail, tail up, back feathers raised, creaking] 8 paying no attention. 8 got out ran along pond edge toward it creaking. 1240 - passed by area on windy track to NARE - 8 displaying again. 1310 - 3 sandplovers in area. some interaction 1st alpha -> pusilla chase with wings spread out bomber-like , creaking.