Stejneger's Scoter
Melanitta stejnegeri
There are a number of differing characteristics of Stejneger's scoter and the white-winged scoter. Males of the white-winged scoter have browner flanks, dark yellow coloration of most of the bill and a less tall bill knob, approaching the velvet scoter. The male Stejneger's scoter has a very tall knob at the base of its mostly orange-yellow bill.
ID text from Wikipedia, CC BY-SA 4.0
Velvet Scoter
Melanitta fusca
The velvet scoter is 51–56 cm (20–22 in) in length and has a wingspan of 90–99 cm (35–39 in). It is a relatively large sea duck with a thick neck, a long broad bill and a pointed tail. The plumage of the male is glossy black with large white wing patches and small white patches behind the eye. The bill is partly orange. The female is similar to the male but lacks the gloss on the feathers and is duller and browner.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Stejneger's Scoter and Velvet Scoter.