The first two times I bred Scream, she made the nest at least a week in advance, so did holland number one. The last two times, Scream never even made a nest, at least she used the nest box I gave her. Holland 1 made her nest in advance as usual, and kindled one dead kit. Holland number three started nesting at least 10 days in advance, so I gave her a box, which she soiled over and over. Finally she made a proper clean nest and kindled 1 dead kit on the wire. There seems to be no pattern, so I give the box when I see them nesting, and if I don't see them nesting around day 30, I make the nest myself.