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Gobisaurus (top) compared with Ziapelta, an ankylosaur with a fully developed tail club, as seen in an undated illustration courtesy of Victoria Arbour. One of the most impressive weapons to appear during the Cretaceous Period dinosaur arms race was the big bony tail club wielded by some members of a group of tank-like plant-eaters. A new study provides a revealing, step-by-step account of the evolution of the distinctive tail club possessed by the heavily armored dinosaur Ankylosaurus and its cousins, a bludgeon that likely gave even the ferocious Tyrannosaurus rex reason to fret. (Photo by Victoria Arbour/Reuters)
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