I have 8 female Muscovies and 1 Black Bellied Whistler. (I'm not sure, but the behavior indicates the whistler might be a male.) Anyway, 3 of my girls want to spend nearly the entire day in their nest boxes. Two of them even share a box. I haven't been getting any eggs for almost a month now. I'm thinking the up & down temps have interrupted their egg production. Anybody know why my girls insist on living in their nest boxes?