Bart: I need something for Show and Tell.
Lisa: Just take one of my geodes.
[Bart stares blankly]
The rocks on my desk.
[Bart goes over, picks up something]
No, that's a trilobyte.
[Bart picks up something else]
That's petrified wood.
[Bart picks up something else]
Bart, that's a bran muffin!
-- No petrified birds, however,
"Sweet Seymour Skinner's Baadasssss Song"