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[–] 2 points 7 months ago

Yes, based on a quick lookup, it appears that the first (internal) egg was produced by sexually-reproducing animals over 600m yrs ago. Later, shelled (external) eggs seem to have appeared about ~315yrs ago.

So basically, the egg was a very ancient, fundamental innovation in complex life that appeared well before galliforms (chickens and relatives) did, ~85m yrs ago.

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