I have a Gray Call duck sitting on eggs for about 2 weeks. Last week there was 1 egg broken outside of the nest. I thought nothing about it. Well, today I went out and there is another broken egg. The egg is still intact but with about a half inch hole in the egg. Do you think that the mother duck is doing it (she has never broken an egg before) or something is climbing up the cage and getting in, like a wheasel? The wire around the cage is i think 1 inch or 1/2 inch chicken wire, and the bottom floor is very small holed wire, that nothing could get through. Maybe I should set a small trap tonight, with an egg in it and see if I catch something?