WASHINGTON
Scientists have unearthed a spectacularly preserved,
nearly complete fossil in northeastern China of a feathered dinosaur with wings
like those of a bird, although they doubt the strange creature could fly.
The researchers on Thursday said the fast-running
meat-eater was about six feet (1.8 meters) long and covered with simple
hair-like feathers over much of its body, with large, quill-like feathers on
its wings and long tail.
The largest-known dinosaur with wings, it lived
about 125 million years ago during the Cretaceous Period. Considering its mouth
full of sharp teeth and its overall oddness, University of Edinburgh
paleontologist Steve Brusatte dubbed the dinosaur, named Zhenyuanlong suni, a
"fluffy feathered poodle from hell."
A member of a group of dinosaurs called raptors
closely related to birds, it was a cousin of Velociraptor, although that
dinosaur, featured inaccurately in the "Jurassic Park" films as much
bigger than it was, lived about 40-50 million years later.
"Zhenyuanlong was a dinosaur that really looked
like a bird," said Brusatte, who collaborated with Chinese paleontologist
Junchang Lu. "You wouldn't think of it differently than a turkey or an emu
or a big chicken."
In their form and shape, its wings looked like those
of a modern bird like an eagle or vulture.
"If you saw this wing on its own, you would
probably think that Zhenyuanlong could fly. But it's a fairly big raptor, and
its arms are so short in proportion to its body, that I have a hard time
believing that it could fly or glide or do anything in the air," Brusatte
said.
More likely, Brusatte said, Zhenyuanlong used its
wings for display the way a peacock uses its tail feathers to attract mates and
intimidate rivals. Another possibility is using the wings to brood eggs in the
nest, Brusatte said.
Brusatte said finding a dinosaur with traits like
Zhenyuanlong's raises questions about why wings evolved in the first place.
"Did they evolve specifically for flight? In
that case, Zhenyuanlong perhaps descended from a flying ancestor and that's why
it still has wings. Or, alternatively, did wings first evolve for display or
egg brooding or some other type of function, and then only in some dinosaurs
were they later co-opted into airfoils for gliding and flying?"
Birds evolved from small feathered dinosaurs. The
oldest-known bird, crow-sized Archaeopteryx, lived about 150 million years ago.
The research was published in the journal Scientific
Reports.
reference :
http://www.voanews.com/content/new-dinosaur-called-zhenyuanlong-suni-china/2865979.html
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