... And not so thin egg shells

Good news on the egg front. The last three sets of eggs have been completely normal with good strong shells, so I think we can rule out calcium deficiency. I think Cissy must just had a fright (or was disturbed by one thing or another) while in mid-lay in the nest.

I did, however, do my research, in case it happens again. I found that baked and crushed egg shells should be enough to provide them with calcium, or alternatively I could spike their pellets with a small amount of limestone flour (a calcium supplement for horses) and cod liver oil (to help to absorb the calcium). The important thing is only to give them one supplement at a time, because over-dosing the chickens with calcium might lead to other problems.  

Have I learned anything from this? Yeah, keep your nose out of the coop unless both of the chickens are out!