Canon documentation from the Jurassic Park franchise tells us that Rexy was hatched in 1989. She was moved over to Isla Nublar once her Paddock was completed and finished with construction. As such, she is 5 years old when the Jurassic Park incident occurs.
Michael Crichton's Jurassic Park novel had two Tyrannosaurs, an adult and a juvenile, but Spielberg trimmed it down to just the one huge super predator for the movie.
What happened to the original T. rex in Jurassic Park?
Once having killed a pack of Velociaptors following a few encounters with the human survivors, Rexy was left the queen and apex predator of Isla Nublar. Almost a decade later, she was eventually captured and placed in captivity for Jurassic World on Nublar, residing in T. rex Kingdom.
Rexy: The ENTIRE Story of Jurassic Park's Tyrannosaurus Rex
How big was the T. rex in Jurassic Park 3?
According to ILM's Jurassic Park III Comparative Size Chart, Bull reached a length of 11.3 meters (37 feet), a height of 4.4 meters (14.5 feet), and Glen McIntosh stated his weight was 8 tons (16,000 pounds), making him slightly smaller than other adult Tyrannosaurus.
For as iconic for being one of the most famous dinosaur villains in the series, Rexy's body count is surprisingly low. However, her kills are some of the grisliest deaths in the Jurrasic Park franchise.
Remember that ALL of the dinosaurs at that point are either clones who may or may not have switched sexes, or their descendants. Rexy and Doe aren't just twins, they're clones, as is Buck.
Conclusion: From all this based on the films it can be said that Rexy is a dinosaur character with a distictive violent nature given by her species with a great amount of intelligence, independence. An ability to be very curious, appreciative, and small amount of unique compassion.
Rex had an average lifespan of 28 years, so our Rexy would be near the end of her life in Dominion. Even at that age, she found the strength to rise up and avenge her own death, 65 million years later.
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.
Rexy and JP3 Rex are the only rexes that have official listed size in both website and size chart. According to jurassic world website, Rexy is 40ft long, and 16ft tall. And according to official JP3 size chart, The JP3 Rex is 37ft long, and 14.5ft tall.
rex tasted more like poultry than, say, beef or pork. Its flavor would likely have been closer to that of a carnivorous bird—perhaps a hawk—than a chicken. What does a hawk taste like? It's probably not far off from the dark meat of a turkey but would be more pungent because of its all-meat diet.
In a predator/prey scenario, your relatively tiny size gives you the advantage. The T. rex has you beat in pure speed, but even if you were racing from a starting line, you'd have a healthy lead before the dinosaur even got its massive body into proper running position.
Their DNA is too old since dinosaurs have been extinct for over 65 million years. Any genetic information is not likely to survive for one million years, so the dinosaurs are simply too old to be cloned.
The infant T. rex (Tyrannosaur Fawn) was born on Isla Sorna to two individuals who were Tyrannosaurus rex clones that had went wild after Hurricane Clarissa struck the island. He, like all cloned Tyrannosaurus juveniles, spent his early life in a nest with his parents providing him food in his nest.
Velociraptors in Jurassic Park are significantly larger than velociraptor fossils would indicate. This is because the creatures portrayed in Jurassic Park are actually modeled after another dinosaur called deinonychus. In the novel, Dr. Grant tells Tim that the deinonychus is a type of velociraptor.
