WASHINGTON – 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.
A new study provides a step-by-step account of the evolution of this distinctive feature possessed by the heavily armored dinosaur Ankylosaurus and its cousins, a bludgeon that may have given even the ferocious Tyrannosaurus rex reason to worry.
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