[gecko] Egg physiology

[Racodactylus]

Today I put some recently hatched Phelsuma laticauda laticauda eggs back in
the mother's cage so that she could replenish her supplies.

In doing so, I noticed they, the eggs, were much thinner than I suspected
they were when laid.  I've hatched around 20 of these guys but have never
taken note of this.

Do developing embyroes leach calcium from the egg shell?  It would make
sense.  In addition to supporting developing bones, it would allow hatching
to be that much easier.  A thicker eggshell would be best when the eggs are
being laid, as a lot can happen.  The female can drop them or perhaps young
embyroes are sensitive to vibrations, such as that of the wind or falling
debris.

Well does anyone know anything about this?  Please shine some light on this.

--Daniel