Dinosaur Egg
From Wild World Wiki
A minor fossil.
Blathers says: "Utterly amazing, this is! What a perfect specimen! Figuring out what kind of egg this is might seem easy, but it's actually not. In fact, I must admit that I have no idea how to go about it, eh wot? Still, that very mystery is what's so fascinating about a dinosaur egg! Ah! Hoo. I'm awfully sorry. Inexplicable mysteries tend to set my beak blabbing!"