WASHINGTON - If you're a dinosaur with a nickname as funky as "the chicken from hell," you had better be able to back it up.
A dinosaur called Anzu wyliei that scientists identified on Wednesday from fossils found in North Dakota and South Dakota does just that. It had a head shaped like a bird's, a toothless beak, an odd crest on its cranium, hands with big sharp claws, long legs for fast running and was probably covered in feathers.
It is the largest North American example of a type of bird-like dinosaur well known from Asia. Its extensive remains offer a detailed picture of the North American branch of these dinosaurs that had remained mysterious since their first bones were found about a century ago, the scientists said.
What would someone think if they encountered this creature that lived 66 million years ago? "I don't know whether they would scream and run away, or laugh, because it is just an absurd-looking monster chicken," said University of Utah paleontologist Emma Schachner, one of the researchers.
Anzu wyliei measured about 11 feet long (3.5 meters), 5 feet tall (1.5 meters) at the hip and weighed about 440 to 660 pounds (200 to 300 kg), the researchers said.
"It has the nickname 'the chicken from hell.' And that's a pretty good description," said paleontologist Matt Lamanna of the Carnegie Museum of Natural History in Pittsburgh, who led the research published in the journal PLOS ONE.
"If you could get in a time machine and go back to Western North America at the end of the age of dinosaurs and see this thing, I would say your first reaction might be, 'What a weird looking bird,'" Lamanna added.
"It would not look like most people's conception of a dinosaur."
Scientists think birds arose much earlier from small feathered dinosaurs. The earliest known bird is 150 million years old.
This dinosaur's bird-like traits included a beak, hollow leg bones and air spaces in its backbone, paleontologist said Hans-Dieter Sues of the Smithsonian Institution's National Museum of Natural History.
Its bizarre head crest resembled that of the cassowary, a flightless bird native to Australia and New Guinea.
Fossils of feathers are extremely rare and they were not found with any of the three partial skeletons of Anzu wyliei. But the researchers believe it had feathers based on fossils of close relatives from China that have clear evidence of them.