When was t rex alive

And while they had strong thighs, these dinosaurs were not speedy. They could only walk briskly at up to 12 miles an hour —likely not fast enough to chase a speeding Jeep, as depicted in the movie Jurassic Park. Using biomechanical models, scientists have theorized that if these heavy animals moved any faster, they would have shattered the bones in their feet.

Tyrannosaurus rex had a life expectancy of about 28 years. In January , a study of the fossils of Nanotyrannus —a smaller tyrannosaur that was believed to have lived alongside T. In spite of all its advantages, T. This cataclysm occurred when an asteroid or comet the size of a mountain slammed into Earth, wiping out Tyrannosaurus rex along with the rest of the non-avian dinosaurs and bringing a sudden end to the Cretaceous period. All rights reserved. Common Name: Tyrannosaurus rex.

Scientific Name: Tyrannosaurus rex. Type: Prehistoric Animals. Diet: Carnivore. Size: 40 feet long and 12 feet tall. Weight: Between 5. Animals Climate change is shrinking many Amazonian birds. Animals Wild Cities This wild African cat has adapted to life in a big city. Animals This frog mysteriously re-evolved a full set of teeth.

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Magazine How one image captures 21 hours of a volcanic eruption. The formula could be applied to other extinct animals, Marshall added. Subscribe for our daily curated newsletter to receive the latest exclusive Reuters coverage delivered to your inbox. More from Reuters. Sign up for our newsletter Subscribe for our daily curated newsletter to receive the latest exclusive Reuters coverage delivered to your inbox. In other words, when the T.

Marshall and his colleagues began the project by looking at the relationship between population density and body mass, which is crunched into a formula developed by John Damuth, a research biologist at the University of California, Santa Barbara, who wasn't involved in the study. This formula, known as Damuth's law, is rigorous, but researchers still need to account for ecological differences, including whether the animal has a low or high metabolism and whether it's an herbivore , an omnivore or a carnivore.

For instance, jaguars and hyenas are roughly the same size, but hyenas have a population density that's 50 times greater than that of jaguars, the researchers said. Related: Photos: Newfound dinosaur had tiny arms, just like T. For the calculations, Marshall and his colleagues had to guess T. Based on research , they decided that T. Then, after sifting through the scientific literature, the researchers determined that T.

The team also analyzed how T.