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 Dinosaurs may have been warm-blooded

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PostSubject: Dinosaurs may have been warm-blooded   Sat Jun 30, 2012 2:11 am

Dinosaurs may have been warm-blooded


NORWAY Dinosaurs may have been warmblooded,scientists said Wednesday,in a finding that could debunk one of the most commonlyheld images of the extinct giants.
Researchers in Spain and Norway reported in the journal Nature they had found tree-like growth rings on the bones of mammals,a feature that until now was thought to be limited to coldblooded creatures... and dinosaurs.
They also found evidence that dinosaurs probably had a high metabolic rate to allow fast growth an indicator of warm-bloodedness.
Our results strongly suggest that dinosaurs were warm-blooded, said lead author Meike Koehler.If so,the findings should prompt a rethink about reptiles,she said.
Modern-day reptiles are cold-blooded,meaning they cannot control their body temperatures through their own metabolic system relying instead on external means such as basking in the sun.
While the dinosaurs may have been warmblooded,their other characteristics kept them squarely in the reptile camp,said Koehler.
Palaeontologists have long noted the ring-like markings on the bones of cold-blooded creatures and dinosaurs,and taken them to indicate pauses in growth,perhaps due to cold periods or lack of food.The bones of warm-blooded animals such as birds and mammals had never been properly assessed to see if they,too,exhibit the lines.
Koehler and her team found the rings in all 41 warm-blooded animal species they studied,including antelopes,deer and giraffes.
The finding eliminates the strongest argument that does exist for cold-bloodedness in dinosaurs,she said.AFP
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