Ok I have a problem with one of my chickens, and wondered if anyone had some advice for me. I'm gonna start at the beginning in the hope of getting the best advice on the basis of the whole story, forgive me if I waffle.... I have 3 ex battery hens and Patsy, probably about 2 years old, likes the taste of her own eggs. A few months ago I found a wobbly egg in the nest box (without a shell) even though oyster shell is available. Since then I have had quite a few strange eggs. a few more wobblers and ones with thin shells and quite often I would get what I called 'brain eggs' their shells were thick and hard with a bumpy surface (looked like a brain) though these have now stopped. So I think this is why she started eating eggs, becuase they broke easily. But she will only eat her own eggs; one of the others can lay an egg and it will sit in the box all day if I am at work and she wont touch it. I saw her go in the nest box the other day and waited and watched, hoping to take out the egg before she could eat it. But I didnt want to open it too early and scare her off the next. I heard her pecking and (stupidly) thought she was eating oyster shell from the floor but no! she was eating her newly laid egg. So... I followed some advice I saw in here and filled an egg shell with mashed potato and mustard and put it in the nest box. It sat in there for a couple of days (meanwhile Patsy laid another egg and ate that) then it completely disappeared! I was convinced someone must have taken the egg from the box. It wasn't until I cleaned out the coop yesterday that I found some eggshell with mustard seeds on it. Seems she really enjoyed it! She lays probably every 2 or 3 days but its very rare that I get the egg, she will eat it as soon as she's laid it. The other girls don't join in but will peck at the bedding if it has any traces of egg on it when they go in. I really want to stop this happening, but I now don't know how to. Should I try to harden up the eggs so she cant peck them open so easily or try to stop the pecking behaviour? Help please!