There's got to be at least a little more to it, because some eggs have a speckle you can feel and scratch off while others are completely smooth yet marbled looking. Maybe it depends on when it occurs as the shell is developing.
Goddamn it, now I have to do some research!
the egg shell is very soft and pliable inside - it hardens as it leaves and probably will also lose outer markings
I've had underdeveloped eggs fall out while butchering. Sometimes a nearly transparent egg. There's a membrane under the shell, like a rubber balloon that prevents you from cracking it like a regular chicken egg. That membrane is opaque white, so I assume you'd have to catch it just right for it to be translucent.
Next time I have an oddity like that, I'll definitely post it!
if they lay their eggs in a pool of water, the eggs will still be soft and rubbery
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