Stejneger's Scoter

Stejneger's scoter, also called the Siberian scoter, is a large sea duck. It is separated from the white-winged scoter by several features. The male Stejneger's has a very tall knob at the base of its mostly orange-yellow bill, whereas male white-winged scoters have browner flanks, a darker yellow bill and a lower bill knob. The males are very similar and best told apart by head shape: white-winged scoters show a two-stepped profile between bill and head, while Stejneger's has a long Roman-nosed profile like a common eider's. (Wikipedia, general species account)

Stejneger's scoter breeds over the far north of Asia east of the Yenisey Basin and winters further south in temperate zones, in Asia as far south as China. It forms large flocks on suitable coastal waters, tightly packed, and the birds tend to take off together. It was previously thought rare in North America but may be a regular visitor and possible breeder in western Alaska. A single bird seen in Montana in 2015 is the only confirmed record south of Alaska. (Wikipedia, general species account)