Seismosaur

The Stegosaur is a four-part fossil that can be donated to the museum. It was introduced in and also appears in.

Completing the Seismosaur in City Folk
"...Wait! Did the earth just move? Because the seismosaurus is complete! Hoo, what a mighty moment this is! The seismosaurus is the longest of all known dinosaurs, eh wot? Its body was small for its length, though, and rather light, as well... Proportionally, its brains were also rather light! HOO! I...beg your pardon! I was so enthralled, I... I spouted hot air like a boiling teapot, eh wot?"