@article {livezey1993comparative, title = {Comparative morphometrics of Anas ducks, with particular reference to the Hawaiian Duck Anas wyvilliana, Laysan Duck A. laysanensis, and Eaton{\textquoteright}s Pintail A. eatoni}, journal = {Wildfowl}, volume = {44}, number = {44}, year = {1993}, pages = {75{\textendash}100}, author = {Livezey, Bradley Curtis} }