WaPo (free reg, blah blah) today carried this article detailing new findings about how the most famous dinosaur predator of all grew up. By examining "growth rings" in the bones of several fossil specimens, scientists have determined that T. Rex under went a tremendous growth spurt between 13 and 17 years of age. It's so characteristic and so large they're calling it "super puberty". The findings have implications for both biology and behavior, because before the growth spurt T. Rex's were probably very fast and agile, whereas afterward they're huge and strong.