Clangula Hyemalis, commonly known as the long-tailed duck, is a medium-sized sea duck that can be found in Arctic and sub-Arctic regions. Aside from its scientific name, there are various synonyms used to refer to this species of duck. Some of these synonyms include the oldsquaw, anas hyemalis, long-tailed drake, sea pheasant, and northern diver. These names often highlight certain characteristics of the bird such as its long tail feathers, the sounds of their calls, and their preference for colder climates. Whatever name they may go by, the Clangula Hyemalis remains an interesting and fascinating species of sea duck.