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Palaeontology

As many as 1.7 billion Tyrannosaurus rexes once roamed the Earth

By T.K. Randall
May 18, 2023 · Comment icon 7 comments

That's a lot of Tyrannosaurus rexes... Image Credit: CC BY-SA 3.0 ScottRobertAnselmo
This figure might sound a lot, but it is actually quite a bit smaller than previous estimates had suggested.
Tyrannosaurus rex needs no introduction - this gargantuan carnivorous reptile is widely considered to be one of the fiercest land predators ever to walk the face of the Earth.

But exactly how many individuals were there overall if we count every T.rex that ever lived ?

Back in 2021, a study was published suggesting that there might have been as many as 2.5 billion individual T. rexes, but now a newer study has called this estimate into question - instead putting forward the possibility that the actual number may have been closer to 1.7 billion.
According to study author Eva Griebeler, this difference can be attributed to the inclusion of new information that the original study hadn't taken into account as well as renewed estimates concerning population density, number of eggs laid and average lifespan.

Incredibly, even accounting for this smaller number, the estimate puts into perspective just how rare it is to find a Tyrannosaurus rex fossil.

If the number is accurate, it means we have only found the remains of 0.0000002% of all the T. rexes that ever lived.

The other 99.999999% are either laying in wait in the ground somewhere or are lost forever.

Source: Live Science | Comments (7)




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Recent comments on this story
Comment icon #1 Posted by Skulduggery 11 months ago
I was reading this and scrolling and one of the ad spaces on the page did not load and displayed the classic no internet browser dinosaur game image and I thought that was perfect.
Comment icon #2 Posted by godnodog 11 months ago
really hated the headline really liked the content thanks
Comment icon #3 Posted by Wepwawet 11 months ago
As T.rex is only found in the US, it would mean that there are roughly 180 T.rex "laying in wait" per square mile over the entire US. So, tread carefully so as not to wake them.
Comment icon #4 Posted by Amorlind 11 months ago
Gives an enormous number of herbivorous individuals to feed such a population...
Comment icon #5 Posted by Tatetopa 11 months ago
I think it says that was over a 2.5 million year period.    If they lived 20 years, that would be 125,000 generations.  So there were about 12k roaming around at any one time which seems pretty believable and maybe not even big news.
Comment icon #6 Posted by bmk1245 11 months ago
Still are
Comment icon #7 Posted by NCC1701 11 months ago
Earth wasn't a popular place for aliens back then.


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