Tyrannosaurus was a large carnivorous dinosaur that lived during the late Cretaceous period. It had powerful bone crushing jaws, and somewhat moderate night vision, while having an excellent sense of smell. It is known to be aggressive and territorial and will often chase away competitors. Tyannosaurus has a low metabolic rate compared to other apex predators, and is often referred to as the most powerful dinosaur on the island.

Prey: Adult Tyrannosaurus Rex

Rexes consider anything within reach of a their massive jaws as food. However, there are certain species they have an easier time hunting. These are not long distance sprinters after all.

Territories: Adult Tyrannosaurus Rex

Tyrannosaurus size prevents it from hunting very well in dense woodlands, so they are often found prowling the plains. Coincidentally, close to their main food sources.

Combat: Adult Tyrannosaurus Rex

Hunting successfully usually requires patience from large predators like these.

Too big and clumsy to give chase for long, lone hunters must employ ambush tactics. They hide inside dense growth, wait for prey to get close, then unleash a sudden burst of speed, taking them unawares.

When tackling bigger animals, Rexes form packs that encircle their food, preventing escape. It is best to deal with Tyrannosaurs at VERY long range, for obvious reasons.

Defining Trait

Huge Jaws: The jaws of an adult Tyrannosaurus Rex contain huge teeth, each up to 6 inches long. Strong neck muscles give them an impressive bite force of 35,000 N. Tyrannosaurus possessed a frankly massive mouth, bearing hundreds of teeth. With a bite strong enough to crush bone, it is the ultimate evolution in theropod hunting. Their weak little arms are all but vestigial, it's all about the bite.

Prey: Sub-Adult Tyrannosaurus Rex

Their main diet consists of mid-tier herbivores like Maiasaura, but sub-adult rexes working together can take down larger animals.

Territories: Sub-Adult Tyrannosaurus Rex

Sub-Adult Tyrannosaurs can still hunt adequately within the island forests, they usually prey on smaller animals and hide among the dense shrubbery to get the drop on them.

Combat: Sub-Adult Tyrannosaurus Rex

When a T.Rex grows from juvenile to Sub-Adult, they trade speed and camouflage for a stronger bite force. Successful hunts require more patience as they get older and heavier, relying almost exclusively on ambushing.

Sub-Adults avoid skirmishes whenever possible, since they are still vulnerable to bigger and faster predators. They lack the hardy skin or giant teeth of fully grown rexes, and are still developing their leg muscles, forcing them to either be sneaky or work together in packs to bring down their prey.

Varied Roles

Tyrannosaurus fills different ecological niches depending on its growth phase. Muscle mass increases exponentially as they grow, transforming from an agile raptor competitor into an apex predator.

Legs in Transition

Sub-Adults are in an awkward spot between the leaping bounds of juveniles and the powerful ambush sprints of full adults.

With sudden growth spurts, Rexes pile on the pounds so fast their muscles struggle to keep up.

Prey: Juvenile Tyrannosaurus Rex

Juveniles grow quite large before properly entering the sub-adult stage, but are still tiny compared to most other carnivores. This means they mainly go after smaller prey such as Dryosaurus, but scavenging is also a viable, (though often dangerous) tactic. A juvenile simply has a hard time hunting prey larger than itself.

Territories: Juvenile Tyrannosaurus Rex

Juvenile Rexes stalk the forests, using foliage for cove when hunting their prey. At this age, they are just small enough to fit inside certain man-made structures as well.

Combat: Juvenile Tyrannosaurus Rex

From an early age ,Tyrannosaurs learn the value of stealth. Juveniles must remain hidden from larger predators, and are big enough to accidentally alarm herbivores if they are not careful.

Although they are in direct competition with raptors for food, juvenile rexes are not quite as fast and must rely on ambushing prey. However their more muscular build lets them bully raptors out of a meal.

They of course lack the thick hide of adults, and cannot last long in battle before needing to flee.

From Small Beginnings...

The lifestyle of Tyrannosaurus changes dramatically depending on their age. They pile on the pounds, growing from an average little hunter/scavenger into a monstrous apex predator.


With so many larger predators around, solitary young rexes often seek the protection of adults. Unfortunately for them, adults are just as likely to view these youngsters as food, even if they've made a supplicating gesture, the shrill piercing cries of juveniles can blow the cover of theirs elders...


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