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Researchers: 2.5 Billion Tyrannosaurus Rexes Walked the Earth By Ryan Whitwam on April 19, 2021 at 7:30 am
All that remains of the
Tyrannosaurus rex today is a handful of fossils, but how many of these iconic dinosaurs roamed the Earth? A new analysis from the University of California Berkeley estimates that there were about 20,000 adult Tyrannosaurs at any given time during the Cretaceous period. Add that up over millions of years, and there could easily have been 2.5 billion of these dinosaurs in total.
Paleontologists have unearthed only 32 adult T. rex fossils, which is not enough to estimate their range or numbers. Fossils tell us about individual animals how they lived, how they died, and how they were built. So few animals become fossils that you can’t tell how large a population was just from how many bones are in the ground. However, knowing about the animal’s biology can help make an estimate of population, as long as you’re not
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Learning From California’s Ambitious Climate Policy
By Aimee Barnes, Ashley Conrad-Saydah, Hannah Argento-McCurdy, Angela Luh, and Matthew Gobin
April 16, 2021, 5:00 am Getty/Manny Crisostomo
The Carquinez Bridge looms in the background of the playground area of the Ninth Street Park and Boat Launch in Benicia, California, on February 11, 2014.
Sam Hananel
Ari Drennen
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California has long been synonymous with effective climate policy. Beginning in 2001, the Golden State established its first voluntary emissions reporting program under Gov. Gray Davis (D). Subsequently, Gov. Arnold Schwarzenegger (R) built on this initial commitment to reducing emissions when the state passed the Global Warming Solutions Act of 2006 its landmark climate legislation.
Tyrannosaurus rex. Their name means tyrant lizard king and as far as popular culture goes, they certainly ruled the dinosaurs. But just how many were there?
According to experts from California, the answer is a whopping 2.5 billion of the beasts over the 2.5 million years they roamed North America in the Late Cretaceous.
Around 20,000 adult T. rexes were probably alive at any given point during the species existence give or take a factor of ten, the researchers have estimated.
T. rex along with the rest of the dinosaurs went extinct in the wake of a devastating asteroid strike on the Earth some 66 million years ago.