Kentrosaurus had plates and spikes along its back, but unlike Stegosaurus, its plates were smaller and more numerous, and its spikes were located along its hips and tail.
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Irritator's skull was deliberately altered by fossil hunters who tried to make it more marketable, filing down parts of it before it was studied scientifically.
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Zhuchengtyrannus, despite its large size, is known from relatively few fossils, making some aspects of its anatomy and lifestyle still debated among paleontologists.
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