Non-Migrant: No. All populations of this species make significant seasonal migrations.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: Yes. At least some populations of this species make annual migrations of over 200 km.
Migrates northward in spring, usually arriving on breeding grounds in April-May (late May-early June in far north). Departs far north by end of September, southward migration through U.S. occurs mostly in October-November (Terres 1980). Scaup that breed in northern Alaska, northern Yukon, and Mackenzie Delta winter on the Atlantic and Gulf coasts of the southeastern U.S. (Johnson and Herter 1989). See Johnson and Herter 1989 for information on early summer molt migration in northern Alaska and northwestern Canada.
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