Tyrannosaurus rex

[Spalea]

@johnny rex :

This morning I doubted this number of 2,5 billions T.-rex having roamed on the Earth during their "geological lifetime", the geological time during which the species t.-rex existed... But finally, it's very possible. I don't know if we can reason like this but 2,5 billions t.-rex having roamed during 2,5 millions years, that means that during every moment there were around 1.000 adult t.-rex roaming in their territory. As they were apex predators, they had to defend their territory against intruders of the same species. I can believe that, being apex predators, they were in possession of a very large hunting territory: 1000 km2 ? 1000 X 1000 = 1 million km2.

And 1 million km2 approximately is equal to the Alberta area plus the Montana area (1.060.000 km2 but let us not quibble with that) where mostly T.-rex fossiles have been deterred.

So, 2,5 billions T.-rex having roamed on Earth is a very plausible estimation. Reply