Any of various diving ducks of the genera Mergus or Lophodytes, which feed on fish and have a sharply serrated bill.

plural of merganser

Mergus squamatus, an endangered species of merganser found in eastern Asia

A species of diving duck, Mergus serrator.

plural of red-breasted merganser

plural of scaly-sided merganser

An extinct species of merganser, Mergus australis.