A new study has calculated just how many of these ferocious dinosaurs inhabited the planet before becoming extinct.

Billions of T. rex existed on Earth, scientists reveal.

This is over their complete timeline, ~2.4Myr.

“The researchers said the total population could be as little as 140 million or as much as 42 billion. The 2.4 billion figure is a middle value.

The researchers estimated that there were approximately 20,000 adults alive at any one time.”