Ducks, Geese, etc.
Anseriformes means "goose-shaped". This group consists of ducks, geese, swans, mergansers (collectively, anatids), and also screamers and magpie-geese.
Swimming birds with webbed feet (front-facing toes only); some have a horizontally-flattened bill; many are highly social and vocal, with a hornlike call. Subfamilies within anserinae are controversial, but all the photos I've taken so far are of birds in the two most-accepted subfamilies.
Click image for Anatidae page