Who or what is Willo?
A Dungeons and Dragons player.
A type of fossilized tree.
A 65-million year old Thescelosaurus fossil.

	Why is Willo so important?
Soft tissue and organs were also fossilized with the bones.
It is the first Thescelosaurus found.
It was found in New York.

	What class of animals do scientists think dinosaurs are most like?
Amphibians.
Reptiles.
Mammals.

	How did scientists reconstruct Willo's heart?
They used computer modeling.
They used papier mâchè.
They didn't have to - it was preserved perfectly.