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Tyrannosaur age-population distributions

Greg Erickson and Phil Currie have a nice paper in this week's Science on 
population distributions among the big tyrannosaurs. Once they reached about 
two meters (at age 2), they tended to survive until they reached sexual 
maturity. Then life got tougher.

I've got a report at 

Jeff Hecht, science & technology writer
jeff@jeffhecht.com  http://www.jhecht.net
Boston Correspondent: New Scientist magazine
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