I get these chalky eggs every so often from 3 out of 6 laying pullets. These are all eggs from the same bird: I'm pretty sure it is always the same 3 laying the chalky ones. They were all fall babies who started laying for spring. Anybody know what causes a chalky egg? I can scrub them pretty hard and it only seems that very small edges of the chalkiness will come off. When the water hits it, the chalk marks turn clear, but when it dries they come back again. The hen this egg came from is a flighty bird who alarm calls over a strong wind and often also lays slightly wrinkled eggs (I'm thinking from stress and retaining the egg until she feels safe). The other 5 do not lay wrinkly eggs.