(noun) A large type of diving duck found primarily in coastal marine habitats, though during the nesting season sea-ducks can be found inland as well. Many sea-duck species have specialized salt glands that help them tolerate salt water, and their feathers are thicker and have more down to provide insulation against the severe cold in their Arctic habitats. These birds eat primarily fish, crustaceans and mollusks.
There are several categories of sea-ducks, including eiders, scoters, goldeneyes and mergansers. Other sea-duck species include the long-tailed duck, harlequin duck and labrador duck.
Photo – Long-Tailed Duck © Martien Brand