Like its more famous cousin, Stegosaurus, Wuerhosaurus has a fearsome weapon at the end of its tail. These four sharp spikes are quite effective at warding off all but the biggest or most persistent of predators. The name palaeontologists use for the stegosaurid club is 'thagomizer', which comes from a Gary Larson cartoon showing a caveman telling others that the pointy end of a Stegosaurus was named after the late Thag Simmons, who was apparently killed by a thagomizer.

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