How many T. rex ever existed?

Over the 2 million or so years during which the species existed, 2.5 billion Tyrannosaurus rex roamed Earth. Palaeontologists used a method employed by ecologists studying contemporary creatures to estimate the population density of T. rex during the late Cretaceous period. The figure has allowed researchers to estimate just how exceedingly rare it is for animals to fossilise.

Blogger Comments:

If this speculation did not take into account ecological factors such as the different potential numbers of carnivores vs herbivores, then it is a gross exaggeration.