Earth Trex – Scientists believe that more Tyrannosaurus rex existed in the Cretaceous period landscape than previously thought. In fact, he notes that up to 2.5 billion of them have roamed the earth for about 2.4 million years and 127,000 generations have lived in western North America. Several factors were taken into account, including geographic distance, body mass, growth patterns, life span, the span of a generation, and the total time these dinosaurs existed before they went extinct 66 million years ago. Read more for both videos and additional information.
Scientists also use Damuth’s law to relate population to body mass: the larger the animal, the fewer individuals there are. This puts the total number of T. rex individuals at around 2.5 billion at one time, with about 20,000 adults living at any one time. Today’s T.rex is one of the largest carnivorous dinosaurs, with a 5-foot skull, complete with large, muscular jaws capable of crushing bone.
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Why Iconic? Heck, giant killers with massive teeth, you wouldn’t even dream of if they didn’t have a fossil record. So it’s not just super cool and beyond imagination, it’s real. Like Godzilla, but real. And I think we want to feel small, and T. rex certainly makes us feel small and vulnerable,” said paleontologist Charles Marshall, who led the study published in the journal Science.
Study: 2.5 Billion T. Rex Roamed Earth, But Not All At Once
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Billion T. Rex Roamed Earth, But Not All At Once, Study Finds
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If you travel back to ancient Montana 67 million years ago, you’ll enter the realm of a tyrant: the great predator Tyrannosaurus rex. But, before you venture into the lost world, you might want to know: How close, on average, is the nearest T. rex to you?
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That may seem impossible to know—but after crunching through twenty years’ worth of T. rexresearch, a new study estimates the animal’s population density. In all likelihood, the T. rex is 15 miles away if not closer to you.
The new study, published last Thursday in Science , also translates that population density into an estimate of how many T. rex lived. On average, researchers estimate that about 20,000 T. rex lived at one time and about 127,000 generations of dinosaurs lived and died. An average of 2.5 billion T. species native to North America, possibly as far north as Alaska and as far south as Mexico, reemerged over a period of two to three million years.
The study isn’t the first time scientists have tried to estimate T. rex numbers. In fact, the average population density in the new paper—42 one T. rex per square mile—is close to an earlier estimate published in 1993. But the new study uses the latest T. rex biology research to try to set as much. Exact height above. A lower limit on the total population.
After running millions of computer simulations, each with a slightly different mix of possible values, the total T. rexcount could be as low as 140 million and as high as 42 billion, with an average of 2.5 billion. Similarly, 1,300 to 328,000 T. rex are alive at any one time, with an average of 20,000.
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“It’s exciting to have someone try everything we know about T. rex to try and understand population dynamics,” said Holly Woodward, a paleontologist at the Oklahoma State University Health Sciences Center who was not involved in the new study. . “It’s interesting and exciting that it hasn’t been done at this level.” (Learn more about Woodward’s research on how T. spent his teenage years.)
Over the past 20 years, researchers have discovered an incredible amount about T. rex, including how long it lived (about 28 years), when it reached sexual maturity (about 15.5 years), and how much it weighed as an adult (about ). 15,000 kilograms, average). The data allowed scientists to calculate T. rex’s approximate generation time—19 years, give or take—and T. rex’s average body mass at any given time.
To arrive at T. rex population numbers, the researchers used the relationship between body mass and population density among living animals. On average, when body mass increases 10-fold, population density decreases by more than four-fifths—this is known as the Damut Law.
Damuth, an ecologist at the University of California, Santa Barbara, first discovered this pattern by compiling 30 years of ecological data on living mammals. However, Damut’s law is invalid because animals vary in their lifestyles and specific habitats. For example, the spotted hyena and the jaguar have the same body mass and are both predators, but the population density of the hyena is about 50 times greater.
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When applied to T. rex (after correcting for the fact that T. rexis was not a mammal), Damut’s Law states that the true total number of dinosaurs is between 140 million and 42 billion individual dinosaurs.
“In paleontology, it’s hard to estimate things … so what I’m doing is estimating things and thinking more about bracketing. Can I put a strong upper and lower limit?” said study lead author Charles Marshall, a paleontologist at the University of California, Berkeley.
In addition to knowing how many of these elephant-sized carnivores existed, Marshall and his team were able to calculate these numbers to estimate how often the fossils formed. Can the probability of T. rex fossilizing be calculated the same way we can calculate the probability of being struck by lightning?
There are a hundred or so known specimens of T. rex, but about two-quarters of them are in private or commercial hands and cannot be reliably studied. So to set a minimum amount of fossils for study purposes, Marshall’s team limited the number to 32 T. rex fossils in public institutions.
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Of all the T. rex that ever lived – about 2.5 billion – yielding only 32 fossils, only one in 80 million T. rex fossilized after death. Although a large percentage of fossilized animals and we did not find remains, this very small probability emphasizes that the carcass was buried quickly enough and under the right chemical conditions for mineralization and fossil formation. . “If T. rex had been a thousand times less abundant—2.5 million if not 2.5 billion in total—we might have found it,” Marshall said.
The method described by Marshall’s team can be used for other extinct organisms. Among dinosaurs, the Cretaceous herbivore Maiasaura, known from hundreds of specimens ranging from newborns to adults, is one of the best candidates, the researchers say.
For Woodward, one of the most exciting mysteries is how rare dinosaur fossils are. If this rate holds for species other than T. rex, researchers could also estimate how many types of dinosaurs are not just fossilized—and now irrevocably lost to time. “So being able to recognize how much we’re missing is probably just as important as knowing how much we have,” he said.
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