2017 Waterfowl Population Survey Total populations were estimated at 47.3 million 2017 Duck Species Breakdown Select Species Mallard Gadwall American wigeon Green-winged teal Blue-winged teal Northern shoveler Northern pintail Redhead Canvasback Scaup Gadwall PreviousNext 2017 Gadwall Numbers2017: 4.180 million. +13% change from last year2016: 3.712 millionGadwall are +111% over the long term average. Gadwall 1955-2017 Estimated Breeding Populations [chart not available] * in millions