Fairly recently one of my 12 girls has decided to sit most of the day in a nest, and when anyone tries to lift her to see if she is sitting on eggs, they get resoundly PECKED! I have left her on 2 ceramic eggs to see if she is going broody, but find her in another nest next time I visit. I wouldn't mind if she wants to brood some of her own, but I guess I'm not getting her ideas about how she wants to go about this. Please educate me. How do I know which are "her" eggs and which are the eggs someone else has left there recently.