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  1. Greater scaup - Wikipedia

  2. The Bluebill Duck: How To Identify, Hunt, and Cook Scaup - Field & Stream

  3. Greater Scaup Identification - All About Birds

  4. 25 Unique Ducks With Blue Bills (Ultimate Guide With Photos!)

  5. Lesser scaup - Wikipedia

  6. Greater or Lesser Scaup? Here Are the Biggest Differences …

  7. Photo Essay: Greater and Lesser Scaup | Ducks Unlimited

  8. Blue-billed Duck - eBird

  9. Greater Scaup (Aythya marila) - GRSC - Birds of North America

  10. Blue-billed duck - Wikipedia

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