This is Euoplocephalus tutus of the Ankylosaurid family.  

Fossils of Euoplocephalus have been found in many parts of Canada and the United States.  The animals mass could approach two tonnes.  It likely squated down when attacked creating an impervious shell of protection.  Flipping this animal over was the only way to injure it.

Euoplocephalus  was amoung the most common of the ankylosaurs.  Studies of this animal have provided the most information on ankylosaurs.


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