Large armored dinosaur with a turtle-like body and heavy knobby tail

Euoplocephalus is a large armored dinosaur, a smaller member of the same family as ankylosaurus. It has a generally turtle-like, armored body with spiked edges and a heavy knobby tail which it uses as a weapon. If attacked, or even just threatened, it will not hesitate to turn around and apply its tail to whomever or whatever is troubling it.