Looked it up and here is one link that lists some poisonous plants to ducks/chickens and they don't list willow http://birds.knoji.com/what-plants-are-toxic-for-chickens-and-ducks/Side track sec.. i am trying to dig out all the willow trees in and on pond of property renting, after neighbor cut field. for hay and all them down mostly. will the willow roots ect in and around pond hurt the ducks that i haven't found and dug or cut out yet, or poison water they swim and drink? they maybe eating the willow they get at before i do?