Bought this for my ducks to prevent the mice from eating their food. It is designed for chickens which are smaller birds so it takes some time for them to figure it out. Propped it open during the day with a small weight until they figured it out. I have not given it 5 stars because the nuts keep popping out. Replacing the inner nut with a washer and putting a washer inside the outer nut improved the performance. I suggest the manufacturer use this method.