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. Though Ankylosaurus has been a well-known dinosaur for many decades, it was not formally described in full until Kenneth Carpenter undertook the task in 2004.
Size: 7.41" L x 2.54" W 2.46" H x ( 19 cm x 6.5 cm x 6.3 cm )