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Creation
Tyrannosaurus rex was created by InGen scientists in their compound on Isla Sorna around 1990 or before.

The clones, like all of InGen's cloned theropods, had pronated hands, but that wasn't all the differences the T. rex clones had. The clones displayed sexual dimorphism, with the females being the largest of the two genders and having brown skin. Males, however, were smaller than the females, had more prominent lacrimal ridges, and their skin had a shade of green that seemed to vary depending on the individual. The clones were known to hunt prey by seeing movement, which is currently unknown in the original Tyrannosaurus and might be an abnormality because the originals had excellent eyesight and sense of smell that aided them in hunting. It has also been observed that cloned Tyrannosaurus ambushes prey.

The cloned Tyrannosaurus rex were great parents to their young. They would usually have one offspring at a time who would stay in a nest while the parents would provide food for it for about 2 weeks until the juvenile learned to hunt on its own. If a Tyrannosaurus baby went missing, its parents would go search for it by hearing its cries or by smelling its blood. Even if they had retrieved their juvenile if Tyrannosaur parents smelled their offspring's blood on a potential threat they would confront it. The clones seemed to have had an accelerated growth cycle as both game hunter Roland Tembo and Dr. Sarah Harding estimated the age of an infant to be 2 weeks of age when a tyrannosaurid of its size would be at least 2 years old. Furthermore, the Tyrannosaurus rex named Rexy was the size of a 28-year-old when she was only three.

There has only been one Tyrannosaurus rex known to have been transported to Isla Nublar to live in Jurassic Park: an individual known as Rexy. She first arrived on the island in 1990 and lived in the Tyrannosaur Paddock of Jurassic Park.

Isla Nublar Incident (1993)
see Rexy

The Tyrannosaurus rex Rexy was supposed to have been seen by InGen's endorsement team on their tour of Jurassic Park. However, despite attempts by Ray Arnold to lure her out of her paddock with a live goat, Rexy did not reveal herself to the visitors. When Dennis Nedry disabled most of Jurassic Park'security with Whte rbt.obj, Rexy was one of the dinosaurs that were able to roam the island freely. After she ate the goat that was left for her, she attacked the endorsement team who were stranded near her paddock because of Whte rbt.obj disabling the power and even killed one of their members, Donald Gennaro. After pushing the tour vehicle of Lex and Tim Murphy off a cliff, she attacked Dr. Ellie Sattler and Robert Muldoon who searching for the survivors.

Rexy then began to travel to the other paddocks in the park. One of the first paddocks she traveled to was the Triceratops Paddock where she battled the leader of the Triceratops herd in the enclosure named Lady Margaret where the Tyrannosaur won the battle while Lady Margaret was wounded and possibly died in the fight. In the morning, Rexy arrived in the Gallimimus Enclosure and killed an individual that lived there. Her next destination was the Visitor Center where inside she killed The Big One, a violent Velociraptor, and her remaining subordinate. While still in the Visitor Center, she encountered a group of survivors who she had encountered before, Nima Cruz and Dr. Gerry Harding and his daughter Jessica Harding. Rexy attacked and chased the three, but they managed to escape.

She later attacked the helicopter of mercenaries Billy Yoder and Oscar Morales who were hired by InGen to rescue any remaining humans still on Isla Nublar, though their chopper took off before she could do any more damage. Afterward, she went to the Parasaurolophus Paddock to hunt its inhabitants. Rexy's last known action in the Isla Nublar Incident of 1993 was having a skirmish with the remaining survivors at the North Dock. She caused the last known fatalities of the incident but did not kill all of the survivors because they managed to flee in one of the dock's boats.

After the Isla Nublar Incident of 1993 Rexy became wild on Isla Nublar, probably living off surviving dinosaurs as a source of food and as a way to counter the Lysine contingency. Rexy remained this way for over a decade.

Wild on Isla Sorna
The Tyrannosaurus rex on Isla Nublar became wild after Hurricane Clarissa struck the island. They were freed by either breaking out of their cages or by the workers on the island before they fled. To counter the Lysine contingency, T. rex and the other carnivorous dinosaurs ate herbivores who in turn ate lysine rich plants as one of their sources of lysine.

Tyrannosaurus rex had varying levels of success on Isla Sorna. In the island's south, they were the apex predator of the region, but in the north they were undermined by Spinosaurus.

Isla Sorna Incident (1997) & San Diego Incident
see Tyrannosaur Buck, Infant T. rex, Female Tyrannosaur

A Tyrannosaurus rex family was involved in both the Isla Sorna Incident of 1997 and the following San Diego Incident. Their involvement began when the son was taken from the parents by InGen Hunters Roland Tembo and his hunting partner Ajay Sidhu so they could use him as bait to lure the father because Roland wanted to hunt a male Tyrannosaurus. While the infant called for his parents to rescue, Peter Ludlow accidently broke his leg while drunk when he was startled by the sound of an animal moving through the undergrowth.

After the Gatherers freed the dinosaurs captured by the InGen Hunters, one of them named Nick Van Owen discovered the infant T. rex and his broken leg. He decided to take him back to his team's mobile labortory, where he and Dr. Sarah Harding fixed the juvenile's leg. However, his parents arrived after first aid was applied to the juvenile and cornered the RV. Dr. Sarah Harding realized that the two Tyrannosaurs weren't exhibiting hunting behavior so she convinced her fellow Gatherers to hand the young T. rex to his parents.

The Tyrannosaurus parents put their child in a safe place, but they soon returned to the mobile lab to push it over a cliff. However, Eddie Carr saved his fellow Gatherers from falling with the RV, but soon afterward the Tyrannosaurus parents split him in half as he was trying to escape them. Even though the family was reunited, the Tyrannosaur parents traveled to the new camp of the Gatherers and the Hunters because the smelled the blood their son on Dr. Sarah Harding's shirt. InGen Hunter Carter alerted his group upon seeing the Tyrannosaur Buck investigating the tent of Dr. Harding and Kelly Malcolm.

While the Hunters fled the Female Tyrannosaur followed, killing many of them in the process. As the Tyrannosaur Buck continued his search but was knocked out by concentrated carfentanil fired from Roland Tembo's double barreled rifle. After the Female Tyrannosaur's attack, Peter Ludlow ordered the remaining InGen Hunters to confiscate the Tyrannosaur Buck and recapture the juvenile T. rex for Jurassic Park: San Diego. But his plan went astray when the Tyrannosaur Buck escaped confinement upon reaching San Diego, California and went rampaging throughout the city, killing several civilians.

To stop the chaos, gatherers Sarah Harding and Ian Malcolm broke into Jurassic Park: San Diego to steal the baby Tyrannosaur so they use him to lure his father back into the docks. The plan worked, but Peter Ludlow was killed by the Tyrannosaurs when he tried to recapture the juvenile. The Tyrannosaur Buck's rampage ended when Dr. Harding tranquilized him before the San Diego police could shoot him. Both Tyrannosaurus father and son were reunited once more with the female when they transported back to Isla Sorna.

Isla Sorna Incident (2001)
During his time marooned on Isla Sorna, Eric Kirby collected T. rex urine that he used to detour small carnivorous dinosaurs like Compsognathus, though he also learned that it attracted Spinosaurus as well.

While a sub-adult male was eating a Parasaurolophus carcass, he encountered a group of humans consisting of Dr. Alan Grant, Udesky, Billy Brennan, and Paul and Amanda Kirby. They tried to avoid him by standing still, but the Tyrannosaurus rex noticed them and began to chase them. His chase of the humans ended quickly when he encountered a Spinosaurus, who was the first to pursue the humans. The two large theropods let out a loud roar as they initiated a fight. Unknown to the sub-adult, he nearly stepped on Dr. Alan Grant who was under him when getting into a stance just before the first strike in the conflict was made.

The male Tyrannosaurus was the first to attack in the dual, biting down on the neck of the Spinosaurus and bringing it down to the forest floor. The Spinosaurus regained balance, however, and began to snap at his flanks, which he returned the favor. After the Spinosaurus swiped at him, the male decided to ram into his opponent head first. This turned out to have been a bad move for the Tyrannosaurus rex, as the Spinosaur was barely phased from the attack and then proceeded to bite down on his neck. As the male sub-adult roared in agony, the Spinosaur, with support from its arms, proceeded to snap his neck. As the Tyrannosaurus rex's body collapsed to the ground, it nearly crushed Dr. Alan Grant while he was escaping.

The Spinosaurus then claimed the corpse of its fallen foe triumphantly.

Jurassic World
see Rexy

Oddly, there have been no known clones of Tyrannosaurus that were created for Masrani Global Corporation's Jurassic World. Instead, Rexy who had been wild on Isla Nublar for over a decade was captured sometime during Jurassic World's years of operation, presumably before it opened. It is unknown why Rexy was captured, but it could have been because InGen's paleo-DNA had gone missing. However, a recent video filmed inside the Hammond Creation Lab about the process of cloning dinosaurs showed Tyrannosaurus rex as one of the dinosaurs inside the nursery. Though new genetic material of T. rex could have been discovered after Rexy's capture and the opening of Jurassic World.

The lone Tyrannosaurus lived in the T. rex Kingdom attraction.