Warm and fuzzy T. rex? New evidence surprises

April 4, 2012 By ALICIA CHANG , AP Science Writer
Warm and fuzzy T. rex? New evidence surprises (AP)
This artist concept provided by the Beijing Institute of Vertebrate Paleontology and Paleoanthropology shows a new species of tyrannosaur, Y. huali, discovered in China. 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, Brian Choo)

The discovery of a giant meat-eating dinosaur sporting a downy coat has some scientists reimagining the look of Tyrannosaurus rex.

With a killer jaw and sharp claws, T. rex has long been depicted in movies and popular culture as having scaly skin. But the discovery of an earlier relative suggests the king of may have had a softer side.

The evidence comes from the unearthing of a new tyrannosaur species in northeastern China that lived 60 million years before T. rex. The preserved remains of fluffy down, making it the largest ever found.

If a T. rex relative had feathers, why not T. rex? Scientists said the evidence is trending in that direction.

"People need to start changing their image of T. rex," said Luis Chiappe, director of the Dinosaur Institute at the of Los Angeles County, who was not part of the discovery team.

Much smaller dinosaurs with primitive feathers have been excavated in recent years, but this is the first direct sign of a huge, shaggy dinosaur. Scientists have long debated whether gigantic dinosaurs lost their feathers the bigger they got or were just not as extensively covered.

Artists' depiction of Yutyrannus huali. Artwork by Lida Xing and Yi Liu.

The new tyrannosaur species, Yutyrannus huali, is described in Thursday's issue of the . Its name is a blend of Latin and Mandarin, which translates to "beautiful feathered tyrant."

A team of Chinese and Canadian scientists analyzed three well-preserved fossil skeletons - an adult and two juveniles - recovered from a quarry in China's Liaoning province by a private fossil dealer. Most striking were the remains of down-like feathers on the neck and arm. Though coverage was patchy, scientists suspected the species had feathers over much of its body.

Warm and fuzzy T. rex? New evidence surprises
Skull of Yutyrannus. Photo may be used freely to accompany an article on this new animal, but should be credited to Mr Zang Hailong. Future requests for use should be directed to Prof. Xu Xing.

It would have felt like touching "long, thick fur," co-author Corwin Sullivan of the said in an email. Another scientist, Thomas Holtz Jr. at the University of Maryland, compared it to the feathers of an emu.

The creature lived about 125 million years ago. At 30 feet long and weighing a ton, Y. huali would have reached T. rex's chest.

The dino-fuzz likely provided insulation, though camouflage or showing it off like a peacock could not be ruled out.

Since T. rex is related to this newfound feathery species, chances are good that T. rex was feathered as well, scientists said. Just don't mistake fuzzy for cuddly. The predatory dinosaur would have been just as menacing.

Having feathers "doesn't make it less threatening or less fearsome," said Holtz, who had no role in the research.

Matthew Lamanna, assistant curator at the Carnegie Museum of Natural History, said T. rex most likely was covered in both feathers and scales.

Whatever the coverage of , the latest fossil finds "force us to conceive of tyrannosauroids in a new way," said Julia Clarke at the University of Texas at Austin.

Explore further: Feather structures in maturing dinosaurs changed as they grew

More information: www.nature.com/nature/journal/ … ull/nature10906.html


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3.3 / 5 (7) Apr 04, 2012
This changes that whole "How do you get down off a horse" joke doesn't it?
3.7 / 5 (6) Apr 04, 2012
so it was certainly warm blooded ! No use having insulation without an internal heat source. It would have been counterproductive to insulate a cold bloded animal that needs heat from the environment to get into its body from the outside.
1.3 / 5 (14) Apr 04, 2012
I think this is just disinfo from stuffed animal manufacturers. Basterds.

These guys.
5 / 5 (4) Apr 04, 2012
DNA shows it to be an ancestral relative of the chicken. So not surprised it probably looked a bit like a big scary chicken.
1 / 5 (2) Apr 04, 2012
"Having feathers doesn't make it less threatening or less fearsome."

Lies. Reality is killing my childhood.
2.1 / 5 (7) Apr 04, 2012
Really cool. Maybe they should re-release Jurassic Park with a feathery T. Rex instead.
Apr 05, 2012
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Apr 05, 2012
This comment has been removed by a moderator.
1.7 / 5 (12) Apr 05, 2012
Dinosaurs are looking more and more like their modern bird relatives.
1 / 5 (2) Apr 05, 2012
Did TRex had feathers? Nope, just Chuck Testa!
5 / 5 (1) Apr 05, 2012
Oh, so that is what all the fuzz was about!

@ WhiteJim:

Not to make a hen out of a feather as we say here (no, really!), but a poikilotherm wouldn't necessarily be warm-blooded:

"Many terrestrial ectotherms are poikilothermic.[1] However some ectotherms remain in temperature-constant environments to the point that they are actually able to maintain a constant internal temperature (i.e. are homeothermic). It is this distinction that often makes the term "poikilotherm" more useful than the vernacular "cold-blooded", which is sometimes used to refer to ectotherms more generally.

Poikilothermic animals include types of vertebrate animals, specifically fish, amphibians, and reptiles, as well as a host of invertebrate animals. The Naked mole rat is the only mammal that is currently thought to be poikilothermic."
1 / 5 (1) Apr 05, 2012
Interesting if true, but let's wait to see that this isn't another fraud like Archaeoraptor...
not rated yet Apr 05, 2012
Sam Neill was right!
2 / 5 (4) Apr 05, 2012
@Torbjorn ... This find clearly resolves that it was hotblooded at that point in its evolution. The fuzz evolved out of prior scales to function as insulation of the body to reduce its heat loss ... later the fuzz evolved into feathers permitting flight etc...
1.6 / 5 (13) Apr 05, 2012
I wonder how long it will be before they can re-enginner a dinosaur from a chicken embryo. That would be fascinating. http://www.livesc...aur.html
1.5 / 5 (17) Apr 05, 2012
I wonder how long it will be before they can re-enginner a dinosaur from a chicken embryo. That would be fascinating. http://www.livesc...aur.html
Terror bird my favorite iteration. Engineer a few dozen of these. I bet they shriek like banshees.

Apr 05, 2012
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1 / 5 (3) Apr 06, 2012
Dinosaurs must have lived in water, scientist claims But water animals usually lack the fur.

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