13 Terrific Facts About The Tyrannosaurus Rex - The Fact Site (2023)

If you were to go around and survey people on what the most famous dinosaur that ever lived, they would probably say the Tyrannosaurus Rex.

If you were to ask about the scariest dinosaur, you’d probably get the same answer again.

For those of you who don’t know that much about dinosaurs, here’s a general idea of what a Tyrannosaurus Rex was like.

Firstly, they were terrifying large, measuring up to 40 feet (12.3 m) long and 12 feet (3.66 m) when measured up to the top of their hips.

They were one of the largest of all known predators that ever roamed the earth, weighing in at around 9.3 tons (8.4 tonnes) to 15.4 tons (14 tonnes).

Now that we have a vague idea of what a Tyrannosaurus Rex (T-Rex) looked like, let’s have a look at some of the more interesting details that really stood them apart from other dinosaurs!

The Tyrannosaurus Rex has a very regal name.

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The man responsible for naming the Tyrannosaurus Rex was Henry Fairfield Osborn, the president of the American Museum of Natural history at the time of the dinosaur’s discovery and identification in 1905.

Osborn and his associates instantly recognized that this new dinosaur was at the top of its class and as such needed a fitting name.

Osborn eventually chose the name Tyrannosaurus Rex, bringing the Greek words “tyrannos” meaning “tyrant”, “sauros” meaning lizard, and the Latin word “Rex”, which translates to King.

Through its name the Tyrannosaurus was crowned king, or more specifically, the Tyrant Lizard King!

The T-Rex had arms that were so small it will make you laugh.

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In case you missed it, these fearsome pre-historic beasts had absolutely ridiculous little arms.

While your average T-Rex would have loomed multiple times higher than your average human, their arms were only just a bit longer than ours!

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While the average human arm is around 2.1 feet (64 cm) long, a T-Rexes arm was just 3.3 feet (1 meter) long!

We also still have no idea what their arms were for!

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Some scientists claim that the arms of a Tyrannosaurus Rex were vestigial, meaning they were something left over from a previous evolution (like our tail bones).

This is most likely untrue, as the bones in their arms have clear signs that despite their size, their arms were incredibly muscular!

So, what were they for? We may never know! It’s something that we may only ever be able to make crazy hypotheses about.

Some of the more realistic theories state that they were used to hold onto prey while attacking them with their vicious jaws or to help themselves get up off the ground.

The Tyrannosaurus Rex had one of the most powerful bites of all known dinosaurs.

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While their arms may have been tiny and just a little bit ridiculous, don’t begin to think these pre-historic predators weren’t a fearsome foe!

A fully-grown T-Rex had quite the impressive bite, with a jaw that was around 4 feet (1.2 m) long.

You wouldn’t ever have wanted to see a Tyrannosaurus Rex smile, either – An adult T-Rex had 60 teeth, some measuring up to 1 foot (30.5 cm) long!

As scary as those teeth sound, they’re nowhere near as scary as its bite – A 2012 study found that of all land animals ever studied, the T-Rex had the strongest bite!

It was found that they could exert up to 12,814 pounds of force (57,000 N) with their vicious jaws.

To put that into perspective, a human can bite down with around 175 pounds of force (778 N), making a Tyrannosaurus Rex’s bite more than 73 times stronger than ours!

They may have had a few feathers, too!

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(Video) T-Rex Facts for Kids | All about the Tyrannosaurus Rex

This is a point that is certain to ruffle a few feathers among long-term T-Rex fans.

The jury is still out on whether the Tyrannosaurus Rex had any feathers, but it’s looking more and more likely.

Studies on close relatives of the T-Rex have found insulating feathers over much of their bodies.

A 2017 study that reviewed all evidence to date of skin samples concluded that if the Tyrannosaurus Rex had ever had any feathers, they would have only been found on the upper parts of the body, possibly running along its back and neck.

The Tyrannosaurus Rex only lived in North America.

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Although they’re now famous all over the world, the T-Rex only ever lived in a small part of the ancient world called Laramidia.

In prehistoric times, Laramidia was an island continent that now makes up parts of the west coast of North America, from Alaska down to south-west Mexico.

They were both hunters and scavengers.

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For a long period of time it was assumed that the Tyrannosaurus Rex was a predatory carnivore, but there was simply no evidence to back it up.

A 2013 study changed all that though when a T-Rex tooth was discovered embedded in another dinosaur’s tail bone.

Until that point in time, the only evidence we had of the eating habits of the Tyrannosaurus Rex was based upon their feces, which contained remains of crunched up bones.

From what we now know, though, the T-Rex would both hunt for food and pick the bones of already dead dinosaurs clean (and eat them too!)

The Tyrannosaurus Rex had a pretty short lifespan.

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T-Rexes were the apex predator of their time, with no other dinosaurs hunting them for food.

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As such, they really only died from diseases, accidents, starvation, or old age.

From the data that has been collected from T-Rex fossils thus far we have a fairly accurate guess of their lifespan.

While some of their ancestors and other four-legged dinosaurs could live as long as 100 years, the T-Rex lived for just 30!

A small town in South Dakota is heralded as the T-Rex capital of the world.

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According to them, at least! The town of Buffalo, South Dakota, has a population of 330 people, and 7 T-Rex skeletons.

That’s just about one T-Rex for every 50 people!

To put that into perspective, there have only been around 50 major specimens of the Tyrannosaurus found, with only a few being a complete fossil of the dinosaur.

It’s no small wonder the Tyrannosaurus Rex was such a good hunter.

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And, apparently, a lot of it comes down to their eyes!

The vast majority of lifeforms that have ever lived have one thing in common – if they had eyes, they generally pointed outwards, rather than forwards.

If you’ve ever watched a bird look at you with one eye, then turn their head to look at you with the other eye, then you know what I mean.

Some creatures have eyes that point forwards, instead of sideways, such as eagles, and humans of course.

T-Rexes also had forward-facing eyes, and it gave them greater depth perception than the rest of their kind, giving them a serious advantage.

Their other senses were heightened, too!

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Studies have found that the Tyrannosaurus Rex was also rather gifted when it came to their other senses.

They had large olfactory nerves, which indicates that they had a heightened sense of smell, allowing them to track their prey from miles away.

They also had a long cochlea (get your head out of the gutter, please), which indicated they had a heightened sense of hearing too, which was quite uncommon among most other two-legged dinosaurs.

But they ran slower than we humans do, probably.

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It’s not something I would ever want to put to the test, at least personally! This is yet another point that paleontologists can’t agree on, either.

While some studies have shown that the T-Rex could reach maximum speeds of 17 miles per hour (27 km/h), others have claimed they could reach speeds up to 43 miles per hour (70 km/h).

I don’t know about you, but I’d rather imagine them as slow, lumbering beasts!

The Tyrannosaurus Rex was one of the last land-based dinosaurs alive.

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In the grand scheme of things, the T-Rex was pretty unlucky.

Dinosaurs roamed the earth for around 100 million years, from about 165 million years ago until their mass extinction 66 million years ago.

The Tyrannosaurus Rex came onto the scene pretty late, just 68 million years ago, enjoying just two million years at the top of the food chain before what was most likely an asteroid slammed into the Earth.

One of the most exciting things about paleontology is that nothing is ever certain, and everything is just a working hypothesis.

For all we know, a new fossil could be unearthed tomorrow which completely changes our idea dinosaurs.

Who knows, maybe we’ve got so much wrong about the T-Rex, and it actually had wings? Stranger things have happened, I’m sure!

(Video) T-Rex Facts!

FAQs

What did T. rex eat? ›

T. rex was a huge carnivore and primarily ate herbivorous dinosaurs, including Edmontosaurus and Triceratops. The predator acquired its food through scavenging and hunting, grew incredibly fast and ate hundreds of pounds at a time, said University of Kansas paleontologist David Burnham.

What is a T. rex real name? ›

Henry Fairfield Osborn, then the president of the Museum, gave the dinosaur its name in 1905: Tyrannosaurus rex, “the tyrant lizard king.” T. rex mount in the Museum's Cretaceous Hall in 1960.

What are some fun facts about T. rex? ›

Tyrannosaurus rex, whose name means “king of the tyrant lizards,” was built to rule. This dinosaur's muscular body stretched as long as 40 feet—about the size of a school bus—from its snout to the tip of its powerful tail. Weighing up to eight tons, T. rex stomped headfirst across its territory on two strong legs.

What dinosaur has 5000 teeth? ›

Nigersaurus
Nigersaurus Temporal range: Aptian – Albian
Genus:†Nigersaurus Sereno et al., 1999
Species:†N. taqueti
Binomial name
†Nigersaurus taqueti Sereno et al., 1999
11 more rows

How did T. rex sleep? ›

There is no way to tell from a fossil whether the animal was sleeping when it died or not. But it seems likely that the four-legged dinosaurs probably mostly slept standing up to allow them to respond to predators more rapidly. Two-legged dinosaurs like T-Rex almost certainly lay down though.

How fast could T. rex run? ›

How did T. rex walk? ›

When walking, the T. rex would have had its tail suspended in the air. In this position known as “passive suspension,” the dinosaur's tail would have actively bounced vertically with each step.

What is the enemy of T. rex? ›

Triceratops, an armored prey, is Tyrannosaurus' most common rival. It is a massive herbivore with three strong, powerful horns that could easily penetrate T. rex's skin in one swing. Triceratops also have a bony frill and are known to defend themselves well with a T.

Did T. rex lay eggs? ›

rex parents cared for their young before or after they hatched. No T. rex eggs or nests have ever been found, but fossils of other Tyrannosaur relatives suggest that they laid elongated eggs, roughly 20 or more at a time.

How long did a T. rex live for? ›

These studies, done in conjunction with paleontologists at AMNH, document that that Tyrannosaurus, which attained a weight of more than 10,000 pounds as an adult, reached sexual maturity at about 20 years of age and lived for up to 28 years.

Was the T. rex a bird? ›

Birds evolved from a group of meat-eating dinosaurs called theropods. That's the same group that Tyrannosaurus rex belonged to, although birds evolved from small theropods, not huge ones like T. rex. The oldest bird fossils are about 150 million years old.

Did T. rex eat plants? ›

Tyrannosaurus rex may have been a flesh-eating terror but many of his closest relatives were more content with vegetarian fare, a new analysis by Field Museum scientists has found.

How fast did T. rex grow? ›

Though a range of ages (15-25 years) was found for the specimens studied, the seven individuals demonstrate that T. rex reached effectively full size in less than 20 years. The growth rate of T. rex was comparable to that of the African elephant, which has a similar mass and time to maturity.

Are T. rex friendly? ›

The T-Rex had good manners. There once was a friendly T-Rex, Who bit other dinosaurs' necks, He had little arms, But one of his charms, Was the way that he showed his respects. He always said “Please” and “Thank you”, “Good morning” and “How do you do?” They said, “Will you quit?

What dinosaur has 15 horns? ›

One, Kosmoceratops richardsoni, had 15 horns on its head, while the other, Utahceratops gettyi, had five.

Which dinosaur is still alive? ›

In an evolutionary sense, birds are a living group of dinosaurs because they descended from the common ancestor of all dinosaurs.

What is the fattest dinosaur? ›

The heaviest dinosaur was Argentinosaurus at 77 tonnes. It was the equivalent to 17 African Elephants.

How fast could T. rex run? ›

What is the enemy of T. rex? ›

Triceratops, an armored prey, is Tyrannosaurus' most common rival. It is a massive herbivore with three strong, powerful horns that could easily penetrate T. rex's skin in one swing. Triceratops also have a bony frill and are known to defend themselves well with a T.

How fast did T. rex grow? ›

Though a range of ages (15-25 years) was found for the specimens studied, the seven individuals demonstrate that T. rex reached effectively full size in less than 20 years. The growth rate of T. rex was comparable to that of the African elephant, which has a similar mass and time to maturity.

How much did the T. rex eat? ›

“A 6-ton T. rex,” Healy said, “would need the same daily calories as 80 people” on a diet of 2,500 calories per day. That translates to about 140 kilograms of meat, which the virtual T. rex had half a day to track down in the model.

Videos

1. 5 Dinosaurs that could KILL a T-Rex!
(Goji Center)
2. How the Tyrannosaurs Ruled the World – with David Hone
(The Royal Institution)
3. Spinosaurus vs Tyrannosaurus Rex | Dinosaur Musical | Dinosaur Story | Pinkfong Songs for Children
(Pinkfong Baby Shark - Kids' Songs & Stories)
4. this week's random facts, dino edition 11/13
(Amy Hayes)
5. #13 - Dinosaur Facts and a NEW DINO POEM Every Day - Today's Featured Creature: RHINOREX "Nose King"
(Mr. Mike Sgrignoli)
6. The Rough Life of SUE the T. rex
(Denver Museum of Nature & Science)
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