Other Names: none
Distribution : northeastern Siberia and western Alaska.
Size: 66-89 cm in length.
Plumage: The body and wings are silvery gray; black and white feather margins give it a scaled bluish appearance. The head, neck, and tail are white, and the throat is black. Juveniles are matte gray overall. The beak is peach, the legs are yellow, and the eyes are black.