Study: 2.5 billion d. Rex roamed the earth, but not all at once

Author SETH BORENSTEIN AP Science Writer
A Tyrannosaurus Rex is scary enough. Now 2.5 billion of them are film. A fierce dinosaur king may have roamed the earth in two million years, a new study has found.
Using calculations based on body size, sexual maturity and the organism’s energy needs, a team from the University of California, Berkeley discovered how many D. rexes lived over 127,000 generations, according to a study in Science magazine on Thursday. This is a first-type number, but not a d. Rex size is an estimate with the margin of error.
“That’s a lot of jaws,” said Charles Marshall, director of the University of California Museum. “It has a lot of teeth. That’s a lot of nails. ”
These species roamed North America for about 1.2 million to 3.6 million years, i.e. d. The population density of Rex was small at any given moment. The study said there would be about two at a location of 3,800 in Washington, D.C. or California.
“Like a lot of people, when I first read that 2.5 billion T. rexes had never lived, I doubled over to make sure my eyes weren’t fooled,” said Christie Curry Rogers, a paleontologist at McCallster College. Not part of the study.
D. Marshall said the assessment helps scientists determine the safety rate of Rex fossils and underscores how lucky the world is to know about them. About 100 or more d. Rex fossils have been found – 32 of which are enough to find out if they are adults. 2.5 million instead of 2.5 billion. If Rex had been there, we would never have known they existed, he said.
Marshall’s team calculated the population using a common biological rule of thumb, which states that the larger the animal, the less dense the population. Then they eat meat d. Rex added estimates of how much energy is needed to stay alive – somewhere between a Komodo dragon and a lion. The higher the energy requirement, the less dense the population. D. They also attributed the fact that Rex reached sexual maturity somewhere between the ages of 14 and 17 and lived for a maximum of 28 years.
Given the uncertainty over the generation length, range and how long they roamed, the Berkeley team said the total population could be as high as 140 million or 42 billion.
The science of meat-eating, which lives on the largest land of all time, is important, “said James Barlow, a geography professor at the University of Purdue.
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Follow Seth Borenstein on Twitter at Twitterborenbears.
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The Associated Press Department of Health and Science receives support from the Department of Science Education at Howard Hughes Medical Institute. AP is solely responsible for all content.

Sophia Harrison

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I'm Sophia Harrison working as a part-time staff at the Costco since the past year until I become as an author at the iron blade, hope I can use my experiences with the supermarkets here.

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