I have an aviary in the garden with cockatiels. The two nest boxes have 2 chicks in each. They are doing very well,but it wll be a few weeks before they are old enough to climb out into the aviary. I am concerned that as they are producing droppings in the boxes,they are attracting flies. One year I found moths had laid their eggs. This can't be good for the chicks. I wonder if anyone has suggestions as to what I could do