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Study: 2 5 billion T rex roamed Earth, but not all at once
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How many T rex were there? Billions, it turns out
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How do shiny rocks get shiny? The answer is disgusting when it comes to dinosaurs Mark Price, Charlotte Observer © Dreamstime/TNS Some shiny round rocks are gastroliths, or gizzard stones from dinosaurs.
You might want to wash your hands the next time you check out an unusually shiny rock.
Turns out fossilized poop called coprolites isn t the only disgusting thing dinosaurs left behind for modern man to find lying around.
There are also gastroliths, an odd bit of the fossil record that is well disguised by natural beauty. Often, we are shown pictures of shiny rocks and asked if they are gastroliths. But what is a gastrolith? Dinosaur National Monument in Utah posted on Facebook.
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.
Dinosaurs: Billions of T-Rex once roamed the Earth, scientists say
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