This undated photo of a fossil provided by the Beijing Institute of Vertebrate Paleontology and Paleoanthropology of a new species of tyrannosaur, Y. huali, shows it had feathers on its tail. A new study published in the journal Nature found that Y. huali, an earlier relative of T. rex had a feathery coat, suggesting that the king of dinosaurs may have also been fuzzy. (AP Photo/Beijing Institute of Vertebrate Paleontology and Paleoanthropology, Zang Hailong)  

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