Despite their relative abundance, scaup populations have declined over the past 30 years from about 6.3 million birds in the 1970s to 4.2 million in last year's survey. Ducks Unlimited has supported a variety research to determine the reasons for this downward trend in scaup numbers. While no single cause for this decline has been found, DU is working to protect and restore habitats that are important throughout the scaup's annual cycle, including key breeding areas such as the western boreal forest, important migration areas like the Great Lakes, and southern wintering areas such as the Gulf Coast.
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resource to get more information and images regarding bluebills.