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Another bird-like species discovered in the same area was featured in a separate published study from the caenagnathid species, Anzu Wyliei. Anzu would have lived between 66 and 68 million years ago, and paleontologists first thought their discovery was just a young specimen of the Anzu.
However, the Hell Chicken showed a few distinct and dissimilar signs compared to Anzu. The Anzu would have been the size of a grizzly bear as far as weight is concerned, and the Hell Chicken seemed notably smaller. This newly discovered avian dinosaur would have only stood about waist-high with a long curved neck that made it a little taller.
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