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Covered in armor and weighing up to 13,000 lbs., Ankylosaurus was the tank of the dinosaur world. Its name means â€œfused lizard because the bones in its skull and many other areas are fused together, making this dinosaur that much tougher and harder. Add a tail club for good measure, and you've got a creature that most predators would think twice about messing with! History: Ankylosaurus was first discovered in 1906 by Barnum Brown in Montana. Based on these incomplete remains, Brown created a reconstruction that lacked the characteristic tail club, and also had its osteoderms (armor plates) arranged in near-parallel rows. Future specimens would reveal the tail club and more osteoderms of varied shapes and sizes - it was not formally described in full until Kenneth Carpenter undertook the task in 2004. Scientific Name: Ankylosaurus magniventris Characteristics: Ankylosaurus was covered in bony protective plates, and professionally painted Ankylosaurus toy figure.