n.diving ducks of North America having a bluish-grey bill

同義詞：scaup duckbluebillbroadbill

A Decoy Trap for Male Lesser Scaups
Foods of lesser scaups on breeding, migration, and wintering areas.
Food and Feeding Habits of the Scaups in Connecticut Waters
Contaminants In Wintering Canvasbacks And Scaups
Time Budget of Behavior among Lesser Scaups on Delta Marsh
Contaminants in Wintering Canvasbacks and Scaups from San Francisco Bay, California
Underwater Foraging Behavior of Canvasbacks, Lesser Scaups, and Ruddy Ducks
The consumption of natural foods by captive canvasbacks and lesser scaups.
BEHAVIOR, BODY CONDITION, AND FOODS OF BUFFLEHEADS AND LESSER SCAUPS DURING SPRING MIGRATION THROUGH THE KLAMATH BASIN, CALIFORNIA
An assessment of distribution and abundance of sea ducks and scaups breeding within the eastern and western section of Labrador Low-...