More than half of a millennium ago, Aztec warriors brandished a weapon called a macuahuitl, a wooden club with jagged obsidian blades embedded on its sides, to inflict gruesome wounds on enemies in close combat.
A newly identified armored dinosaur that inhabited the Patagonian region of Chile did much the same thing to ward off predators about 74 million years ago, with a tail resembling a macuahuitl, scientists said on Wednesday.
The four-legged plant-eating creature, named Stegouros elengassen, exemplifies the arms race that unfolded during the age of dinosaurs to acquire new traits to survive in a perilous world.
It also sheds light
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