Wood Ducks eat seeds, fruits, insects and other arthropods. When aquatic foods are unavailable they may take to dry land to eat acorns and other nuts from forests and grain from fields. Diet studies indicate a lot of variability, but plant materials make up 80% or more of what the species eats. Examples of food eaten include acorns, soybeans, smartweed, water primrose, panic grass, duckweed, millet, waterlily, blackberries and wild cherries, as well as flies, beetles, caterpillars, isopods, and snails.