I bought some chickens earlier this week and one of them is old enough to lay eggs... There were roosters at the place where I bought them, and the egg-laying chicken has given us three eggs already! We're new chicken owners and I only had hens when I was a kid, so I can't tell if this egg looks fertilized or not... she doesn't stay on the egg after she lays it, but after she gets off, when I take it she starts clucking at me... not sure if they normally do this or if she thinks I'm taking her babies... If they are fertile, how many do they usually lay before they're not?