I have a pair of Black Sumatras, the hen laid an egg yesterday, and cracked it. Since they are new, and she didn't lay the egg in the nesting box, I left it in there. This morning I caught the hen eating it! I know this becomes a problem, I have never had to combat it. How do you stop them from doing this? They are literally eating money!!! (I plan to sell for 45 dollars for a 4 week bird.