How big was T.rex? New data shows that the T.rex E.D. Cope, the "Copium rex," was the biggest theropod ever found, increasing theropod size limits to new heights. T.rex was a powerful predatory megatheropod. While Sue and Scotty are currently cited as the biggest T.rex specimens, new measurements of E.D. Cope, from the Black Hills Institute in South Dakota, form a challenge for the title of the megatheropod king. Measurements of this new T.rex femur indicate that Cope may be between 10.6 and 12.4 tonnes, making it the biggest theropod by up to 2 tonnes. T.rex size is a hot debate in paleontology, and Cope just turned it into a bonfire. Copium rex!

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