The "Ducks" part of "Ducks including..." is lumping all ducks, including teal, wood ducks, and wigeons into one general category without listing every species. The "including mergansers, coots and gallinules..." part of "Ducks including..." is lumping those taxa into/as ducks for the sake of classifying legal wildlife. Taxonomically speaking, mergansers, coots, and gallinules are not ducks in the traditional sense. They are in a different family group from ducks, but they are still huntable waterfowl under Federal waterfowl regulations.