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Scientists thought this fossil was a teen T. rex. Turns out it's a new tyrannosaur

03:50
In this illustration, a pack of <em>Nanotyrannus</em> attacks a juvenile <em>T. rex. </em>Scientists say a well-known fossil shows that there was more than one tyrannosaur species roaming what is now western North America. <br> (Friends of the NC Museum of Natural Sciences)
In this illustration, a pack of Nanotyrannus attacks a juvenile T. rex. Scientists say a well-known fossil shows that there was more than one tyrannosaur species roaming what is now western North America.
(Friends of the NC Museum of Natural Sciences)

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