Dinosaurs are a diverse group of reptiles of the clade Dinosauria.They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. That was a long, long time ago. These estimates, based on lifespans of cold-blooded animals, would be too long if dinosaurs had metabolisms more similar to modern birds and mammals. If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (one calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. Sauropod (brontosaur) dinosaurs appear to have had lifespans similar to those of an elephant or human--roughly 70 years. Think of that number, and take it and stretch it out all the way to the Moon… about a thousand times. How old are you? By Katie Hunt, CNN. Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. Why did the dinosaurs go extinct? That’s how long ago the very first dinosaur was alive. Carnivores may have lived to 30 years, herbivores far longer. Yes, an asteroid really did wipe out the dinosaurs, study finds. How long did a T. rex live? Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (one calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. This educated guess is based on examining the microstructure of dinosaur bones, which indicate that the dinosaurs matured slowly. Re: How long did dinosaurs live for? marcusskyfall, Feb 26, 2018: Hi, I'm struggling to work out how such large creatures sustained themselves? When dinosaurs were born, the Earth was a very different place. Are dinosaurs still alive today? How long did dinosaurs live? Did you know that the first dinosaur was born about 230 million years ago? How do you find dinosaur fossils? Scientists do not know the exact lifespan of the dinosaurs, but they estimate that dinosaurs lived about 75 to maybe as much as 300 years. « Reply #1 on: 14/03/2013 06:31:34 » I saw estimates of 75 to 300 years, but of course not all dinosaurs are created equally. It isn't easy to tell from dinosaurs' fossilised remains how long they lived. Subscribe to our newsletter. Learn about the mass extinction event 66 million years ago and the evidence for what ended the age of the dinosaurs. Tyrannosaurus matured at about the same rate we do. Sign Up. One specimen of this now-extinct species, which was an adult when captured, lived a record 152 years in captivity (1766-1918) and had an accidental death. Dinosaurs' long reign on Earth may have had more to do with lady luck than with superiority, according to a study published today in Science.The study challenges the old notion that dinosaurs … On average, T. rex may have lived only about 30 years or so, because it lived dangerously, not only by grappling with well-armed prey, but others of its own kind. If an elephant spends up 4/5's of its day eating then how did dinosaurs manage? Updated 3:00 PM ET, Mon June 29, 2020 ... thereby creating a world largely unsuitable for dinosaurs to live … 4 Minute Read "Traditional" estimates based on slow, reptilian growth rates, combined with the enormous size of dinosaurs, led scientists to conclude it … Of dinosaur bones, which indicate that the dinosaurs matured slowly learn about the mass extinction event million. 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