Any of a number of ducks with blue bills, especially the scaup.
- Scaup (bluebill) numbers plummeted during the past two decades, falling from a high of more than 7 million in the early 1980s to about 3.4 million this year.
- When drought hit the prairies and parkland in the mid-1980s, scaup (bluebill) numbers fell below their goal of just over 6 million.
- The research also determined that body weights of collected bluebills were greater than or similar to estimates from birds collected in the 1980s before the precipitous decline.
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