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2.5 billion T. rex dinosaurs roamed Earth over 127,000 generations, researchers say


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One Tyrannosaurus rex seems scary enough. Now picture 2.5 billion of them. That’s how many of the fierce dinosaur king probably roamed Earth over the course of a couple million years, a new study finds.
Using calculations based on body size, sexual maturity and the creatures’ energy needs, a team at the University of California, Berkeley figured out just how many T. rex lived over 127,000 generations, according to a study in Thursday’s journal Science. It’s a first-of-its-kind number, but just an estimate with a margin of error that is the size of a T. rex.
“That’s a lot of jaws,” said study lead author Charles Marshall, director of the University of California Museum of Paleontology. “That’s a lot of teeth. That’s a lot of claws.” ....

United States , James Farlow , Charles Marshall , University Of California , Purdue University , Macalester College , University Of California Museum Paleontology , One Tyrannosaurus , California Museum , North America , Kristi Curry Rogers , T Rex , ஒன்றுபட்டது மாநிலங்களில் , ஜேம்ஸ் பாரிலோவ் , சார்லஸ் மார்ஷல் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா , பர்‌ட்யூ பல்கலைக்கழகம் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா அருங்காட்சியகம் பேலீயஂடாலொஜீ , கலிஃபோர்னியா அருங்காட்சியகம் , வடக்கு அமெரிக்கா , கிறிஸ்டி கறி ரோஜர்ஸ் , டி ரெக்ஸ் ,

Researchers find 2.5bn T-rex roamed Earth


Researchers find 2.5bn T-rex roamed Earth
AP
Tyrannosaurus rex seems scary enough. Now picture 2.5 billion of them.
That is how many of the fierce dinosaur king probably roamed Earth over the course of a couple of million years, a new study has found.
Using calculations based on body size, sexual maturity and the creatures’ energy needs, a team at the University of California, Berkeley calculated how many T-rex lived over 127,000 generations.
Geologist Bill Simpson uses a feather duster to clean the skeleton of a Tyrannosaurus rex at the Field Museum in Chicago on June 11, 2015.
Photo: Reuters
The study, published in ....

United States , James Farlow , Charles Marshall , University Of California , Purdue University , Macalester College , University Of California Museum Paleontology , Field Museum , Bill Simpson , California Museum , North America , Kristi Curry Roger , The Taipei Times , ஒன்றுபட்டது மாநிலங்களில் , ஜேம்ஸ் பாரிலோவ் , சார்லஸ் மார்ஷல் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா , பர்‌ட்யூ பல்கலைக்கழகம் , பல்கலைக்கழகம் ஆஃப் கலிஃபோர்னியா அருங்காட்சியகம் பேலீயஂடாலொஜீ , புலம் அருங்காட்சியகம் , ர சி து சிம்ப்சன் , கலிஃபோர்னியா அருங்காட்சியகம் , வடக்கு அமெரிக்கா , தி தைப்பே முறை ,

Paleontologists Stunning Conclusion: 2.5 Billion T. Rexes Roamed North America Over the Cretaceous Period


Analysis of what’s known about the dinosaur leads to conclusion there were 2.5 billion over time.
How many Tyrannosaurus rexes roamed North America during the Cretaceous period?
That’s a question Charles Marshall pestered his paleontologist colleagues with for years until he finally teamed up with his students to find an answer.
What the team found, to be published this week in the journal 
Science, is that about 20,000 adult T. rexes probably lived at any one time, give or take a factor of 10, which is in the ballpark of what most of his colleagues guessed.
What few paleontologists had fully grasped, he said, including himself, is that this means that some 2.5 billion lived and died over the approximately 2 1/2 million years the dinosaur walked the earth. ....

United States , San Diego , Hell Creek , Daniel Latorre , Katherine Magoulick , Monte Carlo , Keegan Houser , Felicia Smith , Philip Sandford Boone , John Damuth , Ashley Poust , Connor Wilson , Charles Marshall , George Gaylord Simpson , Santa Barbara , Tanner Frank , Joshua Zimmt , University Of California , University Of New Mexico , San Diego Natural History Museum , Uc Museum Of Paleontology , Museum Of The Rockies In Bozeman , University Of California Museum Paleontology , Tyrannosaurust Rex , North America , California Museum ,