Mark Schwan photographed this mystery bird along the SE Alaska coastline near Juneau earlier this year (I don't have a date). The masked look and pale rump were apparently evident in the field. Mark spent little time studying the bird, concentrating instead on taking photographs. Unfortunately the bird was not seen again. Opinions have been solicited on the admittedly poor photos and several interesting options have been mentioned. Any comments as to the ID (even to group) of this bird would be appreciated, especially from anyone with experience in eastern Asia.