Gavia adamsii
Large and bulky diver with yellow or whitish, heavy bill and square head profile with steep forehead. Usually holds bill uptilted, not pointed straight like Great Northern Diver. Summer: White underparts and chequered black back. Black head and neck with white horizontal band. Winter: White underparts and grey back. Neck usually much more diffusely marked than in Great Northern Diver. Heavy goose-like flight.
Song similar to Great Northern Diver, but slower and harsher. Not very vocal.
Wikipedia: map (se also Xeno-canto below)
Birdlife ecology
