anatidæ

from The Century Dictionary.

• A family of birds corresponding to the Linnean genera Anas and Mergus, and conterminous with the order Anseres or Lamellirostres, exclusive of the flamingos; a family of palmiped, lamellirostral, natatorial birds, containing the ducks, geese, swans, and mergansers; the Chenomorphæ of Huxley.