Hi. I have a female 18 week Mallard hen. Until last week, she would sleep in the cage. Now, she flies away with her mate after eating. They don't come back unless it is feeding time around 6 PM (The only time I see them). They have grown extremely adverse to entering their cage (was never an issue before) and prefers to sleep somewhere in the wild. The female also twist her neck down with her peak repeatedly as if she is building a nest. She does it even though there are no grass or bugs around. Does anyone have a similar experience before their ducks started laying eggs? Thanks!!