Presbyornithidae

Presbyornithidae were a family of waterbirds with an apparently global distribution that lived until the Earliest Miocene, but are now extinct. Initially, they were believed to present a mix of characters shown by waterbirds, shorebirds and flamingos and were used to argue for an evolutionary relationship between these groups, but they are now generally accepted to be waterfowl. In particular, they are most closely related to modern day screamers, both forming a clade at the base of Anseriformes.