I am wondering if anyone else has had this. Our younger birds (Isa Browns) are 1½ yrs old. They have been laying well and still are except we are getting some eggs with thin shells. They always have plenty of oyster shells and they get some granite grit and grit that has some calcium in it, and once in awhile their eggs shells crushed up. Can I be giving them too much calcium? Can age have anything to do with it. I haven't had this problem with my older birds (RIR). I have gotten thin egg shells once in awhile. I found wet spots in some of the nest boxes and thought I might have an egg eater. Now I wondering if it could be shelless eggs and the birds are eating the egg. I haven't found a mess in the nests, just sticky wet spots most every day. I sell my egg so I can't sell the thin shell eggs. The birds are healthy and have been NPIP tested. It's a mystery and I'm wondering if anyone might have an idea.