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Egg-sistential question

A question on dino-eggshells has been put to me recently, and I
thought I'd put it to the group.

When one looks at modern reptiles, practically all of them lay eggs
with a leathery outer shell.  This type of egg is also laid by the
dinosaurian cousin, the crocodile.  However, this does not apply to
birds, who lay eggs with very hard shells.

Are there any thoughts as to when the bird-like egg first evolved?  Is
it purely an Avian trait, or can it be extended to most/all dinosaurs?

Rob Meyerson
Orphan Vertebrate Paleontologist

Homer Simpson hunting: Doe!