Our runner ducks are a few months old now. Since a few weeks we keep finding dead mice. We suspect the ducks but are not sure, maybe they are poisoned by neighbours or have a disease. Reasons we suspect the ducks; - The mice are dead near their hole. Sick or poisoned mice tend to die in their hole. - They don't have open wounds or broken legs or any damage anywhere. Cats or birds of prey tend to leave some wounds (or nothing because they eat them). Pecking duckbills leave nothing. - Due to renovations the garden has been seperated in three parts. Everytime they have to stay in one part for weeks. We only find dead mice in the part where they are. Is it possible the ducks to this?