The other day I found out that six of our US states have official state dinosaurs. Washington wasn't on that list so I say let's give ourselves one. What should it be?

Colorado has the Stegosaurus
Maryland has the Astrodon
New Jersey has the Hadrosaurus
Texas has the Paluxysaurus
and Wyoming has the Triceratops

So, removing those from the list, vote on which dinosaur should be the official state dinosaur of Washington.