One of my girls (began laying this fall) has been laying eggs with lots of calcium deposits. Poor thing! I thought it was just a phase but she's been doing this for weeks now. They free range all day long and rarely touch their feed. They have oyster shell available but they haven't touched it. I give them black sunflower seeds (a handful split between four birds) once or twice a day to get them into the coup for when I let the dogs out to use the restroom. They aren't locked up but 15 minutes. So I'm not sure how to fix "too much calcium" when she's basically eating her natural diet?