eggs without shells

[Rio chicks]

My chicks have only been laying for a month now and I have had 2 eggs without shells. I read here not to be surprised or worried however this AM when I went out one of the hens dropped one and by the time I had come back to get it they had eaten it. Anyone know whats up?

 

[ChickenCanoe]

Thin or no shells tend to break and then they can become egg eaters.

What makes up their total diet?

 

[junebuggena]

Do they have a source of supplemental calcium?