My hen was setting, (it's our first time-we're virgin hatchers), she was happily setting on hers and all the other hens eggs, (they all lay in the same nest box-I have no idea why), She was there for about 2-3 weeks. So, then she moved out four eggs, I moved the eggs back in. Meanwhile, the other hens are still laying in the box on the other end. My hen decided to leave the eggs she's been setting on, and go set on the newest ones, leaving half baked eggs. Why did she do this? Do they leaved them when they think they are ready, or do they sense that they won't hatch so they give up? I did move them in with the newest layed eggs where she is now, just in case.