How many T. rexes were there? Billions.
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Over approximately 2.5 million years, North America likely hosted 2.5 billion Tyrannosaurus rexes, a minuscule proportion of which have been dug up and studied by paleontologists, according to a UC Berkeley study. (Image by Julius Csotonyi , courtesy
About 2.5 Billion T. Rex Dinosaurs Stomped Across The Earth's Surface, Study Finds
2.5 billion Tyrannosaurus rex roamed the Earth though not all at once
Palaeontology: More than 2.5 BILLION T. Rexes roamed the Earth over their 2.5 million years
About 2.5 billion T. Rex roamed Earth but not at once
There were Billions of T-Rex terrorizing Earth
T. rex skull fossil from South Dakota to be auctioned in NY for millions
T-Rex skeleton sells for more than $6 mln at Swiss auction
An estimated 2.5 billion Tyrannosaurus rexes lived and died on Earth •
One of the Most Complete T. Rex Skulls Ever Found May Fetch $20 Million at a Single-Lot Sale at Sotheby's
Scientists say T. Rex walked as slowly as humans
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