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16 Ducks Geese aerial surveys Alaska Atlantic Flyway average brood Baldpate Black Duck blue-winged teal Brant Breeding Ground Surveys Breeding Population Indices breeding season brood counts Brood Index brood survey Broods Observed Bufflehead Canada Goose Canvasback Central Flyway compared to individual ducklings Ducks Geese Coot early estimated fall flight Flyway Continental Gadwall Goldeneye green-winged teal hatch Hunter Mail Survey increase July June Lake late Lineal Mile Mallard Merganser Mississippi Flyway normal northern Alberta Northwest Territories Number of Hunters number of young Pacific Flyway percent above 1950 percent below 1953 Percent Change Pintail potholes Production Indices Production surveys Quebec and Labrador rainfall rains Redhead reduction Ringneck Ruddy Duck Scaup Shoveler Snow Goose South Dakota southern Manitoba southern Saskatchewan Species spring square mile Stratum Swan Total Ducks transect trend water areas Water Conditions water levels waterfowl breeding Waterfowl Hunter Mail waterfowl population waterfowl production Weather and Water winter Wood Duck