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Will the Next Supercontinent Really Drive Mammals to Extinction?

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 ....

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Cooperative Carnivores in the Fossil Record

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. ....

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Lake County News,California - Earth News: How many T. rexes were there? Billions

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, 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 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. ....

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Number of T-rexes that lived in North America could have been in billions

Number of T-rexes that lived in North America could have been in billions
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The Thorny Problem of Tallying Every T. rex to Ever Live

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
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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. In terms of human residents, the state is one of the emptiest in America, but millions of cattle graze on the land unfurling below a generous sky: In 2017, according to figures from the Census Bureau and the U.S. Department of Agriculture, South Dakota’s bovines outnumbered the state’s humans by more than four to one. ....

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