> The variation of internal volumes in the egg would not change the 
> density... In order to change the density, at least one of two things 
> must happen:
> - matter going in or out
> - overall volume changing
> 
> It seems to me that the shell of the eggs would prevent both, but then 
> there might be some permeability or some room for shrinking/expanding.

The shell is air-permiable. It has to be; the embrio would suffocate 
otherwise.

(It may or may not be water-permiable as well, I'm not sure...)

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