It's not 2.5B T. Rex at the same time.<p><i>2.5 billion Tyrannosaurus rex lived and died during the roughly 2.4 million years</i><p>I'm in a meeting so I'm not totally paying attenion to this comment as I write it (sorry) but I believe that works out to just a little over 1000 per year. That's not a huge number for an entire species across an entire planet.
Humans are currently up to 105 Billion Total (since 50,000 BC)<p><a href="https://en.wikipedia.org/wiki/Estimates_of_historical_world_population#:~:text=An%20estimate%20on%20the%20%22total,rate%20throughout%20pre%2Dmodern%20history" rel="nofollow">https://en.wikipedia.org/wiki/Estimates_of_historical_world_...</a>.
Only 2.5B over 2 and a half million years that seems astonishingly low. I wonder if we have any idea about their reproductive lifecycle and lifespan.<p>There are about 1 billion cows on the planet today mostly because we breed them and there are nearly half a million elephants living currently while being hunted by pesky humans.
That doesn't seem like a crazy-high number. If there used to be 100k tigers at any one time, mostly before the problem of too-damn-many-humans, 20k T-Rexes doesn't seem like a stretch. I wonder how broad their range was.
I'm dubious. What do we know about the actual lifespan of the T. Rex? At what age did they reproduce, and how often? What was the survival rate? Mating practices? Territorial behaviors?