This is the ankylosaurus it lived during the cretaceous period. This dinosaur is called a prehistoric tank because if you take a look at the picture it has an armor made almost entirely out of bone and a clubbed tail made for bashing and crushing. The armor is in penetrable and the only weak spot it's his belly. The tail is used to defend himself against bigger predators such as T. Rex but if the T.Rex can flip the ankylosaurus upside down and attack its belly it would be dead.
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