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Tyrannosaurus Rex is probably the most recognizable dinosaur around.br More than 50 specimens have been identified. Several examples have been identified as juvenilebrTyrannosaurus. This has given scientists the ability to document physical changes in T.Rex like estimating its lifespan brand determining how quickly Tyrannosaurus would have grown. The smallest known individual known as the Jordan theropodrdquo is estimated to have weighed only 66 pounds / 30 kg brand was only 2 years old when it died. On the other end the largest specimen ldquoSue weighed over 11 900 pounds / 5 400 kg and was most likely around 28 years old at the time of her death.