Subfamily Merginae is a group of ducks that are commonly known as sea ducks. These ducks are known for their ability to dive into the water and swim for long periods of time. There are several synonyms for Subfamily Merginae, including the term Merginae, which is the group's scientific name. Other synonyms for this group of ducks include the term diver ducks, which refers to their ability to dive into the water, and the sea ducks, which describes their preferred habitat. Other synonyms for Subfamily Merginae include the term surf ducks and the term bay ducks, which both describe their habitat and preferred location.