Gobisaurus (top) compared with Ziapelta, an ankylosaur with a fully developed tail club, as seen in an undated illustration courtesy of Victoria Arbour. REUTERS/Victoria Arbour
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One of the most impressive weapons to appear during the dinosaur arms race of the Cretaceous Period was the big bony tail club wielded by some members of a group of tank-like plant-eaters.The first fully formed ankylosaur tail club appeared around 75 million years ago during the Cretaceous.The Ankylosaurus, measuring around 6 meters, was the largest and last of the ankylosaurs, living at the end of the age of dinosaurs about 65 million years ago.Ankylosaurs from China were crucial for understanding the tail club's origins, including Gobisaurus, from about 92 million years ago, and Liaoningosaurus, from about 122 million years ago.
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