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I have a two part question about the evolution of hard shelled eggs. Now, we
have crocodilians on one end (who I will use as the primitive condition) and
modern birds on the other. Where, in between these two, did hard-shelled eggs
evolve? The Mongolia expeditions have uncovered many ornithischian eggs that
appear to have had hard shells, so the transition may have happened early.
Is it possible that, by developing hard-shelled eggs, the protodinosaurs gained
the advantage they needed to dominate the planet (a hard shelled egg is harder
for a nest robber)?
What could possibly go wrong?