A Gyulafehérvári Római Katolikus Főegyházmegye főpásztora, Kovács Gergely érsek augusztus elsejei hatállyal – más személyi változtatásokkal egyidőben – Takó Istvánt.
Updated:
May 14, 2021 13:33 IST
Not only do they give arms and legs to prehistoric findings, paleoartists help research to reach larger audiences
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The unusual bird Gastornis that lived across Europe, North America and Asia not long after non-avian dinosaurs went extinct. Photo: Mark Witton
Not only do they give arms and legs to prehistoric findings, paleoartists help research to reach larger audiences
Close your eyes and imagine a dinosaur. Did you think of a tall, sinewy, sharp-fanged creature? How did this image pop up in your head considering that dinosaurs lived millions of years before the first modern humans appeared? Of course, there’s
its metabolism– slower than mammals but somewhat faster than a large modern lizard, the Komodo dragon. With Damuth’s law, we then estimated that the ancient world held about one
T. rex every 42.4 square miles (109.9 square km). That’s about two individuals in the entire area of Washington, D.C.
Now we had all the pieces we needed. Multiplying the population density by the area in which
T. rex lived gives us an estimate of 20,000 individuals per generation.
Knowing the total number of T. rex that ever lived unlocks other pieces of knowledge – like the fraction that turn into fossils and were found. (Franz Anthony, CC BY-ND)
April 20, 2021
During 2.4 million years of existence, a total of 2.5 billion
Tyrannosaurus rex lived on Earth, and 20,000 individual animals would have been alive at any moment, according to new calculations.
Tyrannosaurus rex spanned all of ancient North America, and about 20,000 lived at once. Image via 1Ado123/ Wikimedia Commons.
During 2.4 million years of existence on Earth, a total of 2.5 billion
Tyrannosaurus rex ever lived, and 20,000 individual animals would have been alive at any moment, according to a new calculation method we described in a paper published on April 15, 2021 in the journal
Science.
To estimate population, our team of paleontologists and scientists had to combine the extraordinarily comprehensive existing research on
The big idea
During 2.4 million years of existence on Earth, a total of 2.5 billion
To estimate population, our team of paleontologists and scientists had to combine the extraordinarily comprehensive existing research on
From microscopic growth patterns in bones, researchers inferred that
T. rexfirst mated at around 15 years old. With growth records, scientists can also generate survivorship curves – an estimate of a
T. rex generations took 19 years. Finally,
T. rex existed as a species for 1.2 to 3.6 million years. With all of this information, we calculate that
T. rex existed for 66,000 to 188,000 generations.
From the fossil record alone, we had generated a