American Museum of Natural History

(credit:  ROBYN BECK/AFP/Getty Images)

Visitors view the Tyrannosaurus rex “Growth Series” featuring a baby (C), juvenile (bottom) and young adult T. rex (top), in the all-new 14,000 square foot Dinosaur Hall permanent exhibition at the Natural History Museum of Los Angeles July 7, 2011 during a press preview. The young adult, named Thomas, is one of the ten most complete T. rex specimens in the world. At 17 years old, 34 feet long and nearly 7,000 pounds, Thomas completes the unique series showing dramatically rapid growth of the T. rex. Mid-spurt it’s estimated that a T. rex may have gained 1,5000 pounds in one year. The exhibition opens to the public on July 16. AFP PHOTO / Robyn BECK (Photo credit should read ROBYN BECK/AFP/Getty Images)


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