Stegosaur

From Wild World Wiki

The Stegosaur is one of the dinosaurs that appears at the museum after all its fossil parts have been found. The three pieces of the Stegosaur are the Stego Skull, Stego Torso and Stego Tail.

This is what Blathers has to say:

"Woo hoo! Yes, WOOOO HOOOO! I care not who hears my cries of delight! Hoo. Yes. In any case, allow me to tell you about our dear stegosaur. It emerged right around the middle of the era when dinosaurs roamed the earth. The diamond-shaped plates embedded along its back are actually made of bone, wot? Indeed, they were used to keep it cool and also to thwart its enemies. Ah. Hoo. Indeed, so sorry. Stegosaurs never fail to set my beak blabbing!"

The Stegosaur is located in the pink display in the second room of the fossil section of the museum.