Would it be possible to grow a human embryo inside an ostrich egg?
If the egg was fertilized, but the blastoderm excised, replaced with a human egg cell?
I'm wondering that if because of a common Terran heritage, if the molecular hooks and cues would be the same, so that the placenta would form attached to the egg yolk, and feeding from it.
At a first guess, oxygen demands would become a problem. Now if the egg was carefully decanted into a beaker, kept at human incubation temperatures,and a oxygen perfusion rig attached...
As the yolk is consumed, fresh supplies could be added via injection.

This would approach the egg as a development machine which could be hacked to grow other things. Its already done with virii and bacteria, after all.

This could be tested with chicken eggs.

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