Okay, So I have looked at this sites list of treats for my ducks, and at others. I read I could give them leaks, is this true? Also, Spinach? Venison? Sun Dried Tomatoes? Mushrooms? I want food that is easily obtained, or I already have at hand. Or that I can easily grow for them. Also, there is rhubarb that grows wild around me, and my ducks were nibbling at the leaves, is that okay for them?