Tyrannosaurus rex sciifii is a subspecies of Tyrannosaurus rex, a species of large carnivorous non-avian coelurosaurian theropod dinosaur. Tyrannosaurus rex sciifii originally lived throughout what is now western North America, on what was then an island continent known as Laramidia, as an extinct Tyrannosaurus rex subspecies, but has since been brought back from extinction by SciiFii, using some DNA contained in some preserved soft tissue and using genetic engineering, and now lives in Inland Plains section of Cretaceous Park located in Sacramento, California. Like other tyrannosaurids, Tyrannosaurus rex sciifii is a bipedal brown-colored carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hind limbs, Tyrannosaurus rex sciifii forelimbs are short but unusually powerful for their size and have two clawed digits. The largest specimens measures up to 12.3 metres (40 feet) in length, though T. rex sciifii can grow to lengths of more than 12.3 metres (40 feet), up to 3.66 metres (12 feet) tall at the hips, and can weigh around 8.4 metric tons (9.3 short tons) to 14 metric tons (15.4 short tons). Although other theropods rival or exceed Tyrannosaurus rex sciifii in size, it is still among the largest known land predators and has the strongest bite force among all terrestrial animals. By far the largest carnivore in its environment, Tyrannosaurus rex sciifii is an apex predator, it once preyed upon hadrosaurs, armored herbivores like ceratopsians and ankylosaurs, and possibly sauropods when it first lived during the Late Cretaceous, although it is also primarily a scavenger. It has some loose feathers that cover the top of its head, neck, and on the tip of its tail, likely the ancestral features it retained from the ancestors of large tyrannosaurids such as Tyrannosaurus rex sciifii. It has orange eyebrow ridges when fully grown, which indicates a healthy individual. In contrary to myths and popular media, Tyrannosaurus rex sciifii does not roar, but makes slight growls similar to that of alligators and booms similar to that to bitterns. Tyrannosaurus rex sciifii can live to be around 28-30 years old and are either solitary hunters or social pack hunters, depending on an individual. During the mating season, the males fight over other males, until one male is injured (which can lead to a lost arm) or simply gives up, the winning male gets a right to mate. The eggs are laid around 3 months after the mating seasons, the eggs then hatch around 4-5 months after that, and the Tyrannosaurus rex sciifii chicks are cared for by their parents, sometimes the chicks cannibalizes other chicks, until they are almost fully grown, when they must fend for themselves.
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