I've just started getting my first eggs from the first of my chickens. She's an EE, if that matters. I'm wondering why her shells are so thick! I've never seen shells so thick, even from farm eggs I've gotten in the past from other places. Is it because she's been free ranging? We haven't started the girls on layer feed yet because we wanted to finish up the bag of starter/grower. We also haven't given them any sort of calcium supplement yet either. On top of that I never saw any leathery eggs, although that might be because she laid them in a different location that I haven't come across yet. It kinda makes me wonder if I'll need the calcium supplement. Is it the breed? Should I expect the shells to thin as she gets older or we head into Winter and there's no bug source? Should I supplement with bugs in the Winter that are available in canned form for feeding reptiles?