John Damuth News Today

The formation of Pangaea Ultima some 250 million years from now would be bad news for mammalian life. But whether it would mean the end for mammals—or whether the supercontinent will form at all—is far from certain

As Homo erectus expanded its territory from Africa into Eurasia, a species of hunting dog migrated westward into the area. These two predators offer important lessons about sociality and survival.

How many Tyrannosaurus rexes roamed North America during the Cretaceous period? Thats 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, published this month 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 gras...

The Thorny Problem of Tallying Every T. rex to Ever Live The Thorny Problem of Tallying Every T. rex to Ever Live Here’s why it’s really, really hard to count how many of the apex predators once stalked Earth’s surface. The Thorny Problem of Tallying Every T. rex to Ever Live Copy Link How many of you were there? Dimitri Carol/Alamy Stock Photo In This Story Today, South Dakota is home to prairie and pasture, bisected by bands of asphalt and the sprawling squiggle of the Missouri River. I...

About 20,000 adult Tyrannosaurus rexes probably lived at any one time, give or take a factor of 10, a new study suggests. The number is in the ballpark of what most researchers guessed, but what’s few paleontologists had fully grasped, says Charles Marshall, is what that means: some 2.5 billion lived and died over the approximately 2 1/2 million years the dinosaur walked the Earth. Until now, no one has been able to compute population numbers for long-extinct animals, and George Gaylord Simp...

Ideas, Inventions And Innovations 2.5 Billion Tyrannosaurus Rexes Roamed North America over a Period of 2.5 Million Years Over approximately 2.5 million years, North America likely hosted 2.5 billion Tyrannosaurus rexes, a minuscule proportion of which have been dug up and studied by paleontologists, according to a UC Berkeley study.  Image by Julius Csotonyi, courtesy of Science magazine How many Tyrannosaurus rexes roamed North America during the Cretaceous period? That’s a question Cha...

ExtremeTech 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 bee...

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 o...

Credit: Julius Csotonyi, courtesy of Science magazine Over approximately 2.5 million years, North America likely hosted 2.5 billion Tyrannosaurus rexes, a minuscule proportion of which have been dug up and studied by paleontologists, according to a UC Berkeley study. 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 an...

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...