The magpie goose (Anseranas semipalmata) is a waterbird species found in coastal northern Australia and savannah in southern New Guinea.It is a unique member of the order Anseriformes, and arranged in a family and genus distinct from all other living waterfowl.ther Paleogene birds sometimes considered magpie-geese are the genera Geranopsis from the Hordwell Formation Late Eocene to the Early Oligocene of England and Anserpica from the Late Oligocene of Billy-Crechy (Créchy). france