Food Habits
Green-winged Teal, more than any other species of duck, prefer to seek food on mud flats. Where mud flats are lacking, they prefer shallow marshes or temporarily flooded agricultural lands. They usually eat vegetative matter consisting of seeds, stems, and leaves of aquatic and emergent vegetation. Green-winged Teal appear to prefer the small seeds of nutgrasses (Cyperus spp.), millets (Panicum spp.), and sedges to larger seeds, but they also consume corn, wheat, barley, and buttonbush (Cephalanthus spp.) seeds. In marshes, sloughs, and ponds, Green-winged Teal select the seeds of bulrushes, pondweeds, and spikerushes (Eleocharis spp.). To a lesser extent they feed upon the vegetative parts of muskgrass (Chara spp.), pondweeds, widgeongrass (Ruppia maritima), and duckweeds (Lemna spp.). They will occasionally eat insects, mollusks, and crustaceans. Occasionally during spring months, Green-winged Teal will gorge on maggots of decaying fish which are found around ponds.
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