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9 meters (52 feet) long Megalodon would have a mass of about 53 tons
In May 2008
which grew out of the animal's back vertebrae
Discovered in 1923–27 during excavations at Zhoukoudian near Beijing (written "Peking" China
and was named by paleontologist Othniel C
Tyrannosaurus rex, brain endocast Dimetrodon 9 meters (52 feet) longThis is the endocranial skull cast of the brain cavity from an adult T rex. Cretaceous Age. For all it's size and strength, T. rex was relatively small brained. The last photo shows a brin case with labeled features. Late Cretaceous (70 m. y. a.) North America Shipping Included
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