Arctic sea duck. Male has white head with olive smudge in front of eye, black collar, black-and-white wings, and peachy sides and breast that darkens to chestnut on the belly. Female less dazzling, chocolate brown overall with few markings; note square head and white edges on inner wing feathers. Breeds on Arctic tundra; winters in flocks on the ocean. Dives underwater for crustaceans and mussels.