How many T. rexes were there? Billions.

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.

How many T. rexes were there? Billions.

Billions of fearsome T-Rex dinosaurs once roamed North America, new study shows, maybe in your backyard – Daily Democrat

Billions of T. rexes may have roamed North America - Futurity

New study estimates shocking number of T. rexes in Earth's history

Scientists conclude New Mexico fossil is new Tyrannosaurus species

Almost 2 Billion T. Rexes Once Stomped the Earth

2.5 Billion T. Rex May Have Roamed Earth

Tyrannosaurus rex, Jurassic Park Wiki

Why T. rex has tiny arms University of California