Silly question, I know, but they eat so many different things. I always wonder what there is available in the yard for them to forage on. In the summer we have tons of grasshoppers, but what about other times during the year? I just found out they eat dandelions, and sure enough, we don't have any in our yard this year. We feed ours Mazouri water fowl pellets, but it would be nice to know how much of a natural food source are they getting while free ranging in the day. Also, I've heard oyster shell is important for egg production, but what about wild muscovies? What do they do for that? I've seen my muscovies eat a scorpion, spiders, grasshoppers, seeds off of weeds, and dog food. I wish my dog would leave the duck feed alone and the ducks would leave the dog food alone, but that is a topic for another day . . .