The two Anseriformes families are as follows:
(Click on links to see all of the posts in that family.)
Anhimidae - Screamers
Anatidae - Ducks, Geese and Swans
Crested Screamer aka Southern Screamer (Chauna Torquata)
Black Swan
Anseriformes - Ducks, Geese, Swans and Screamers