In this undated photo provided by the Smithsonian Institution on March 18, 2014, Tyler Lyson of the Smithsonian Institution's Department of Vertebrate Zoology, left, and Hans Sues of the Department of... more 
In this undated photo provided by the Smithsonian Institution on March 18, 2014, Tyler Lyson of the Smithsonian Institution's Department of Vertebrate Zoology, left, and Hans Sues of the Department of Paleobiology stand with a reconstructed skull of the dinosaur Anzu wyliei. The birdlike animal, about 7 feet tall, weighed an estimated 500 pounds when it roamed western North America around 66-68 million years ago. Nicknamed the "chicken from hell," the creature was formally introduced with an official name to the scientific community Wednesday, March 19, 2104 as scientists published a description and analysis of its anatomy. (AP Photo/Smithsonian Institution, Brittany M. Hance) less 
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Associated Press | Photo By Smithsonian Institution, Brittany M. Hance
Wed, Mar 19, 2014 5:03 PM EDT