The Common Merganser, often called the Goosander in Europe, is the largest of the sawbilled ducks. All are specialist fish eaters. Common Mergansers are found throughout the northern hemisphere, and in winter can be seen in large flocks, sometimes of thousands of birds. In Europe they nest as far south as the Swiss lakes, but they are principally a bird of the northern forests, favouring fast-flowing rivers for feeding, roosting on nearby lakes at night.
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