'Jousting ankylosaurs' whacked their peers with their 'sledgehammer-like tails'

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'Jousting ankylosaurs' whacked their peers with their 'sledgehammer-like tails'
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Jennifer Nalewicki is a Salt Lake City-based journalist whose work has been featured in The New York Times, Smithsonian Magazine, Scientific American, Popular Mechanics and more. She covers several science topics from planet Earth to paleontology and archaeology to health and culture. Prior to freelancing, Jennifer was a reporter at Interior Design Magazine, and before that she held an Editor role at Time Inc. Jennifer has a bachelor's degree in Journalism from The University of Texas at Austin.

Equipped with massive tails studded with spikes, ankylosaurs were heavily armored herbivores that could do real damage in a fight. Paleontologists once thought that these tank-like dinosaurs used their tail clubs solely to fight off predators, but a new study published Dec. 6 in the journal Biology Letters reveals that they also bashed each other in a show of dominance.

Measuring 20 feet long and weighing 5,500 pounds , the 76 million-year-old specimen from the Cretaceous period contains several broken spikes along its flanks. Sections of fossilized skin on its flanks also show that Zuul's side wounds healed while the dinosaur was still alive.

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