THIS duck has many popular synonyms, among others ringnecked, ring-billed shuffler, ring-necked scaup duck, or blue-bill fall duck (Minnesota), black jack (Illinois), moon-bill (South Carolina). It is found throughout, the whole of North America, south to Guatemala and the West Indies; breeding from Iowa, southern Wisconsin, Minnesota and Maine northward. It is accidental in Europe.

The chief variation in the plumage of this species consists in the distinctness of the chestnut collar in the male, which is usually well defined, particularly in front. There is very little in its habits to distinguish it from the other "black-heads." Like them, it usually associates in small flocks. Its flesh is excellent, being fat, tender and juicy.