2018 Waterfowl Population Survey Total populations were estimated at 41 million © Melinda Garner 2018 Duck Species Breakdown Select Species Mallard Gadwall American wigeon Green-winged teal Blue-winged teal Northern shoveler Northern pintail Redhead Canvasback Scaup Gadwall PreviousNext 2018 Gadwall Numbers2018: 2.886 million. -31% change from last year2017: 4.180 millionGadwall are +43% over the long term average. Gadwall 1955-2018 Estimated Breeding Populations [chart not available] * in millions