The egg came first, since in the question it is not said that what egg and we all know very clearly that dinosaurs laid eggs much time ago than there existed birds.
Birds were formed merely by evolution of flying reptiles.
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They changed slowly from a reptile over million of years. So you must go in the past using time machine and see it coz even no one knows that.......... :)
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This Answer is meaningful, but u'r getting away from your objective answer