Merganser n. (Zool.) Any bird of the genus Mergus (Merganser), and allied genera of the subfamily Merginae. They are allied to the ducks, but have a sharply serrated bill, eat fish, and dive for food. Also called fish duck. Note: The red-breasted merganser (Merganser serrator) inhabits both hemispheres. It is called also sawbill, harle, and sheldrake. The American merganser (Merganser Americanus.) and the hooded merganser (Lophodytes cucullatus) are well-known species.
... are insectivorous in the nursery stage and vegetarian when full grown. Fish forms an inappreciable portion of their food, with the two notorious exceptions of the goosander and merganser, though anglers are much exercised over the damage, real or alleged, done by these birds to their favourite roach and dace in the Thames. These swans belong for the most part to either the Crown or the Dyers' and Vintners' ... — Birds in the Calendar • Frederick G. Aflalo Read full book for free!