Mergansers are fish-eating seaducks in the order Anseriformes, family Anatidae (ducks, geese, swans) and genus Mergus (typical mergansers). There are four living species in this genus. Photos are presented on the species highlighted in red.

Common Merganser or Goosander, Mergus merganser
Brazilian Merganser, Mergus octosetaceus
Red-breasted Merganser, Mergus serrator
Chinese Merganser, Mergus squamatus