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The Dinosaur Egg, also simply called the Egg, is an item in the NES release of Mario's Time Machine. It is a dinosaur egg, although what type of dinosaur is never stated. Bowser travels back in time to the Cretaceous Period, about eighty million years ago, to steal this single Dinosaur Egg, which he then exhibits in his museum. Mario later steals it back from some Koopa Troopas and travels back in time to return it to its rightful place. After Mario drops it off in a nondescript cave, a news article appears thanking Mario for letting a dinosaur live out its life.