I have two hens, 2 and 3 years old who haven't laid an egg in several weeks. It took me a while to figure this out because each hen still goes into the next box, pretty much every day, and sits there for an hour or two. But they leave it empty when they go. They are not broody, as they leave the boxes after sitting there a while and roost at night. They are not molting, they look healthy, they are not eating their eggs, they just aren't laying. Anyone know what's going on? Any hope that they might start laying again? I'm reaching a point where I need to decide whether to cull them, to make room for some new birds, but don't want to be premature about it. Any insights would be welcome. Thanks!