And calcium deficiency is known to cause thin eggshells (5 ).
crush 4 fresh eggshells up finely and add to liquid.
Crushed charcoal and baked eggshells (that have been crushed also prove to be very popular.
An effective way to do this is to put empty eggshells (from hen eggs used to make omelets) in the cage.
A mild abrasive such as rice or crushed eggshells can be used inside containers.