This peculiar Arctic sea duck breeds on the tundra in Alaska and far eastern Russia and winters in massive flocks among pack ice in the Bering Sea. Males have a unique olive-green head with white goggles, a dark breast, and a carrot-orange bill. Females are brown overall with pale goggles. Rarely seen away from a few key sites in Alaska, usually in small numbers. Compare with other eider species; even the dullest young females have pale goggle pattern on head.