How many Tyrannosaurus rexes roamed North America during the Cretaceous period? That’s a question Charles Marshall pestered his paleontologist colleagues with for years until he finally teamed up with his students to find an answer.
Researchers now have an estimate for just how many T. rex once roamed Earth
New study says 1.7 billion T-Rexes roamed the earth before going extinct
The T. Rex May Have Been 70 Percent Larger Than Believed
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In All of Time, 2.5 Billion Tyrannosaurus Rexes Have Roamed Earth, Smart News
1.7 billion Tyrannosaurus rexes walked the Earth before going extinct, new study estimates
Billions of fearsome T-Rex dinosaurs once roamed North America, new study shows, maybe in your backyard – Daily Democrat
How Many Tyrannosaurus Rexes Ever Lived on Earth? Here's a New Clue. - The New York Times
Scientists conclude New Mexico fossil is new Tyrannosaurus species
One of the Most Complete T. Rex Skulls Ever Found May Fetch $20 Million at a Single-Lot Sale at Sotheby's
Why T. rex has tiny arms University of California
Almost 2 Billion T. Rexes Once Stomped the Earth