Dinosaur egg

The Dinosaur Egg is a stand-alone fossil that can be donated to the museum in all Animal Crossing games to date.

Donating Dinosaur Egg in Wild World
Upon donation to the museum, Blathers will comment:

"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."

Donating Dinosaur Egg in City Folk
Upon donating the fossil in City Folk, Blathers will say:

"Hoo, I say! Hoo upon hoo! A fossilized egg! Eggcellent! I must apologize for that atrocious pun. So sorry. I just got carried away in my eggcitement, eh wot? Because this is a grade-A specimen. Hoo hoo hoo! Now, I hate to admit this, but I cannot identify the species of dinosaur that produced this particular egg. I can envision its hatching, though, and from the shards, a new life slowly emerging, a miracle of flesh and bone! Hoo, the wonder of it all! The drama. The spectacle! The ebb and flow! The grass and grit! Life, I say! Life! Hoo, mercy! Hoomy, indeed! I must apologize profusely. I...I was lost in the moment. My beak flaps on its own!"