On the Cornell web site, the icon for diet for the Wood Duck is Insects but the Life History section says, “Diet studies indicate a lot of variability, but plant materials make up 80% or more of what the species eats. ” This agrees with what I’ve read in the Peterson Guide and on the Audubon web site. I’ve also e-mailed the Cornell people about this (although I have not received an answer yet); I think the wrong icon was used by mistake and the main food of Wood Ducks is plants.
The Wood Duck does a diverse, mainly plant-based diet. To prevent confusion, there will not be a question about this on the exam.