Yutyrannus

Yutyrannus was a tyrannosauroid from the Early Cretaceous of Asia.

Characteristics
Yutyrannus are large, robust animals, only beaten out in both aspects by the Tyrannosaurus compared to other carnivores in the region. Yutyrannus are covered in iridescent green feathers everywhere except their heads and their feet, which can change to black depending on the lighting of the area. Their scaly skulls are white, with black stripes running along the mouth. Atop the snout is a large, red crest paired with two red horn-like crests above the eyes. which are smaller on females. On average, females smaller than males.

Yutyrannus are social animals, mating for life with pairs living and hunting together. When hunting, Yutyrannus use their feathers to become excellent ambush predators, as they work both for camoflauge and trap the predator's scent. To work out the size difference between sexes, the male will attack first and capture the attention of the target while the female then attacks from behind. This combination tends to overpower and confuse prey before they are capable of fighting back.

Yutyrannus are very territorial towards any animal that occupies a similar niche to them, such as Utahraptor, and will actively hunt and kill any threat to their niche within their territory. These hunts usually occur within nesting sites, where they will slaughter the adults and then eat the young. In spite of this, the pair present in Vulture Valley were tolerant of the similarly sized Cryolophosaurus, which would follow the tyranosaurs in order to scavenge their kills. This was due to the Yutyrannus being more efficient predators and the Cryolophosaurus being forced to adapt to the role of scavenger upon being outcompeted.

Life in Vulture Valley
Two Yutyrannus were brought into Vulture Valley by the failure of the first particle collider. When the main Utahraptor colony left the valley, the Yutyrannus began a campaign of eradication, seeking to annihilate the remaining splinter families and the single remaining colony of Utahraptors.

During their mission to Research Station 2, Stalker Force and the Utahraptor alpha Sobek were both attacked by the Yutyrannus. While the female attacked Xavier Wise and Syd Kinanne, the male attempted to follow the rest of the squad through a hallway, struggling to squeeze through. The rest of Stalker Force, being chased by Sobek, dove to the floor to avoid him pouncing on them, accidentally forcing the raptor onto the tyrannosaur. The Yutyrannus slammed Sobek against the floor, but was distracted by gunfire from Xavier while its mate was halted by gunfire from Syd. The distraction allowed Sobek to clamber onto the larger theropod's side and both came out of the door, causing the female to charge through the garage and slam into her mate as the Sobek leapt off and ran away. The mates bickered amongst themselves before leaving the facility, attempting to continue their hunt on Stalker Force until James Molnar destroyed the station with C4, scaring the predators away.

The Yutyrannus would bring the Utahraptor population in the valley to its knees, eventually attacking Sobek Colony's main nesting site, but only managed to kill the beta male of the colony when Sobek ambushed the female from a burrow he and his subordinates had dug. The female was torn apart by Sobek and one of his his pack-mates, said pack-mate dying in the attack before her stomach was eviscerated, while the male was forced to deal with a counter-attack from the rest of the pack. Sobek turned his attention to the male after killing the female, whom had also killed one of the raptors, pouncing on the tyrannosaur and knocking it down as it was about to kill the other raptor on him. The blow broke the Yutyrannus' leg, and Sobek finished the animal off by stabbing his killing claw through its eye. The remains of the two Yutyrannus were then incinerated in the napalm strike that killed Sobek and his colony.

Trivia

 * Yutyrannus is the largest known theropod with direct evidence of feathers.
 * The Yutyrannus in Primitive War are under-sized; in reality, the species weighs 3 tons.
 * In real life, Yutyrannus was not described until 2012. In-universe, Yutyrannus was seemingly discovered by the time of the Vietnam War, similar to Utahraptor.