F.A.P. 1962 Calidris alpina Barrow, Alaska © Sept 1 ♂ jnr. light fat. 61.5 Molt advanced, center virtually white, with only scattered general (spotted) feathers. Numerous A-D's as well as E's present. Forward, A-C's reaching through cervical region to lower throat. Dorsally, grey prevailing. A-C's reach to lower neck. Some fully grown winter feathers + A-D's on scapular tract. ② " ♂ jnr. very light fat. 55.3 Molt stage early. A-C's scattered on abdominal and chest regions; upper chest + forward inactive; A-C's on back + scapular, grey evident superficially only in scapulars. No activity on upper back + forwards. ③ " ♀ ad. light fat 70.5 Molt active, breeding plumage showing only scatteredly on both center + dorsum. A-E's present not only on body, but on neck & head as well. Wing molt complete and secondaries except for inner under C-S-C's, which are C-D's. Tail molt complete. ④ " ♀ ad. very light fat. 67.1 Similar to ③, but less advanced, old feathers present on head, especially on neck, scatteredly in back + venter. A-E's over entire body, head + necks, new plumage prevailing. Upper tail