Tyrannosaurus

Tyrannosaurus rex is a large tyrannosaurid native to the Late Cretaceous of North America.

Characteristics
Tyrannosaurus is a large, robust theropod, covered in protofeathers from the base of its neck to the end of its tail which will molt during mating season. Around the neck these feathers form a mane on both sexes, mainly used for protection of the neck region. A Tyrannosaurus' main weapon is its large, muscular head, strong enough to easily snap the frill of a Triceratops, their preferred prey. Their forarms are small, but strong and fill a variety of functions. Their bulk can also be used as a highly dangerous weapons, being able to easily break through concrete structures and kill mangle smaller animals and humans in a single kick.

Tyrannosaurus live in family units, with parents mating for life and young staying with the pack for long periods of time. These family units will form strong bonds with one another, and will nuzzle and display to each other to strengthen their bonds. While the young are too small to defend themselves, the mother will be stay behind to protect them while the father goes off on hunts and chase threats further away from the nest than the female can afford to go. During or after mating season, this can lead to chases lasting for several miles. If the father is incapacitated in a way that means he cannot return to the family, the mother will then take on this priority but will be forced to take the young with her, putting them at risk.

Tyrannosaurus are sexually dimorphic, with the male having iridescent feathers and green scales along with two crests, one made of feathers vaguely similar to a horned owl's and another mad of keratin along the snout. Females have brown scales and feathers. These feathers are also molted after breeding season, as the male was shown to have done on his throat, leaving him with white pin-feather quills adorning his neck and face between the bare scales.

The Arrival of Vulture Squad
A pair of Tyrannosaurus were brought into Vulture Valley in Vietnam by the failure of the first USSR particle collider, leading to the pair quickly destroying the Russian compound and establishing a nest at the northeastern part of the valley. Within a year, their hunting activity had eliminated the local elephant population.

A year later, Vulture Squad searching for a missing Green Beret platoon, squad member Xavier Wise spotted the Father Tyrannosaurus as he was heading home with an elephant leg in its jaws while they camped in a jungle clearing. Due to the fact that it was dark combined with the wind blowing toward Vulture Squad, the Father failed to detect them and left the squad unharmed. Meanwhile, Squad leader Ryan Baker and his subordinate Leon Varnes encountered the Mother Tyrannosaurus in her nest, startling her and her offspring and causing the Mother to give chase. After escaping her, they were quickly found by the Father, who gave pursued them, but after forcing him to slow down on a hill the pair hid in a ditch in an attempt to lose him. The Father, after repeated attempts to flush them out, attempted to sniff them out but was caught by surprise when they began running again. The soldiers eventually found a cliff above a river, being forced to jump off with the tyrannosaur slipping and falling in behind them. Ryan ended up being forced to pull a drowning and unconscious Leon out of the water with the timely intervention of a nearby Andrei Wynn in spite of the Father's continued panicked attacks, and the three of them escaped into the mangroves on the rivers edge. The Father, now stuck at the bottom of the cliff, called out to the Mother and their young as they came to check on him.

The Father would remain separated from his family for the rest of the day, and eventually stumbled upon Vulture Squad as they were rendezvousing with the Father Vulture, attacking the helicopter and nearly taking off its landing skids before being forced to let go with gunshots. The Father's wandering would later take him to a Viet-Cong encampment, which he investigated but was eventually convinced that they were empty.

Destruction of the Collider
While the Father was gone, the Mother had taken her two young to go on a hunt near a Russian Compound. The chicks ended up going too close to the compound and one was shot by a guard while the other fled the scene. While the guard dragged the dead chick inside to show their leader Grigory Borodin, the Mother attacked the base in an attempt to recover it, quickly moving through the open gate and finding the carcass. After a vein attempt to wake it up, she turned her attention to the soldiers cowering around the compound and went on a rampage, killing many of them. Hearing the commotion, the Father began attacking one of the compound's walls until he broke through, where he greeted his mate and began displaying and nuzzling her until they both noticed Sergei Medvedev watching the spectacle, and began chasing him until he tricked the pair into breaking through the wall of a building housing the second particle collider, where they attacked and killed the remaining personnel. Once they had seemingly killed everyone, they returned to their surviving infant whom had also entered the collider and were nuzzling it until they heard a gunshot, turning to see a surviving Borodin running from them. The entire family gave chase, only stopping and returning to their nest the following morning when they smelled a hunting party of Utahraptors nearby.

The Hunting of Stalker Force
A year after the collider's destruction, the Father Tyrannosaurus and his mate was still roaming the enclosed Valley, where they hunted the herds of Triceratops and Parasaurolophus. During Xavier's, Andrei's and Stalker Force's pursuit and tracking of the Utahraptor colonies in the Valley, the squad came upon the Mother Tyrannosaurus and her surviving baby, now as large as a Clydesdale horse. While trying to sneak away from them through the bamboo surrounding the nest, they were forced to hide as the Father Tyrannosaurus made his way home. By this time, the Father was molting and his surging adrenaline made him even more dangerous. Xavier was nearly found by the Father until one of his men loosed a flare, distracting the beast. This gave Stalker Force the chance to run, and Xavier goaded the Father back towards his nest, losing him in the bamboo as the Father Tyrannosaurus chose to check on his mate and offspring rather than continue the pursuit.

However, this did not last long, as the Father Tyrannosaurus pursued them back to the remnants of the Russian Compound, where it chased Stalker Force and Jericho's mercenary team, the Hyenas. During the attack, the Father kicked Hyena member Dutch in the back while breaking through the wall, breaking his spine. As the rest of the Hyenas ran from the predator, Squad-members Scarecrow and Mr. Crowley decided to leave him in order to slow down the Tyrannosaurus. As they made their escape for the helicopter, Hyena member Nguyen, in a state of panic, killed Scarecrow with his machete, leaving his body for the Father to devour as they escaped.

Trivia

 * The Father and Mother Tyrannosaurus are larger than any real examples of known specimens of Tyrannosaurus. While some, such as Sue and Scotty come close (42-43 feet, respectively), they do not reach the 45-foot length described in the novel.