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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: T. rex as a Kid
9 May 2011 3:00 pm
Even the most terrifying meat-eating dinosaurs were children once, and now scientists have uncovered one of Tyrannosaurs rex's most immature relatives—a 2 or 3 year old (7 or 8 in equivalent human years) whose skeleton is nearly intact. According to a paper published today in The Journal of Vertebrate Paleontology, the 70 million year old fossil belongs to Tarbosaurus bataar, an enormous carnivorous dinosaur of the tyrannosaurid family that was the length of a four-story building from head to tail. Following an exhaustive anatomical analysis (see video of skull), the researchers say this juvenile, which was about the size of an adult human, was not able to crush bone or exert strong bite and twisting forces with its jaw like its parents. Thus, unlike adults who probably did not travel with them and dined on other large dinosaurs, young Tarbosaurus likely hunted small reptiles. Such large dietary differences between a juvenile well past infancy and an adult are rare in the animal kingdom and unprecedented in the world of dinosaurs, the researchers say. If paleontoloists didn't know as much as they do about Tarbosaurus, say the authors, they would think this youngster belonged to a separate species.
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