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.

Dinosaurs: Billions of T-Rex once roamed the Earth, scientists say

Billions' of Tyrannosaurus rexes said to have walked the Earth in all of history - National

Almost 2 Billion T. Rexes Once Stomped the Earth

The Family Feud Behind a $32 Million T. Rex Named Stan - WSJ

New dinosaur was more dangerous than Tyrannosaurus Rex - Deseret News

There were Billions of T-Rex terrorizing Earth

Two and a half billion T. rex dinosaurs once lived, study finds

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

Billions of Tyrannosaurus rexes once roamed earth, study shows

Study: 2.5 billion T. rex roamed Earth, but not all at once - Hawaii Tribune-Herald

About 2.5 Billion T. Rex Dinosaurs Stomped Across The Earth's Surface, Study Finds

Like Godzilla, but actually real': study shows T. rex numbered 2.5 billion

Here's how scientists calculated how many T. Rexes lived on Earth

Like Godzilla, but actually real': study shows T. rex numbered 2.5 billion - The Japan Times