Merganser are several species of carnivorous ducks characterised by their crested heads and slender bills. They are diving ducks, pursuing fish, crustaceans or other invertebrates, underwater. Their bills have a serrated edge to help grip their slippery prey. For this reason, they are sometimes known as "sawbills". There are four species of extant "typical" Mergansers, and two that are considered "aberrant", that is to say - closely related but not of the same Genus. This species, the Hooded Merganser, is one of the aberrant species. It occurs naturally in North America, although vagrants have been found in Europe.
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