Sea ducks are a group of waterfowl that inhabit coastal and offshore waters. These ducks are known for their unique adaptations for swimming in rough aquatic environments. They are also prized for their meat and feathers. There are several synonyms for the term "sea duck." These include: seaduck, ocean duck, marine duck, coastal duck, and saltwater duck. Sea ducks come in many varieties, and each has a unique appearance and behavior. Some of the most commonly recognized species of sea ducks include the eider duck, scoter, goldeneye, and the merganser. These fascinating birds are a vital part of the marine ecosystem, and they play an important role in the food chain.