We do know that Stegosaurus' plates could have been used for threat or courtship displays and would have had the ability to "blush" red when flushed with blood.

Stegosaurus had an extremely slow maximum speed, only slightly faster than a human walking. A stegosaur had no chance of outrunning Allosaurus.

Stegosaurus was a dedicated plant eater and would have spent most of its time eating mosses, ferns, horsetails, cycads, conifers or fruits.

Stegosaurus was a member of the subgroup of dinosaurs called Ornithischia: the bird hipped dinosaurs.

The dinosaur's digestive system was not powerful enough to process such tough Jurassic vegetation. A number of herbivorous dinosaurs would swallow stones to mash up vegetation in their stomachs as a kind of prehistoric liquidiser.

The rock formation allows us to step back in time and see a landscape of rivers, lakes, and vast plains. A perfect setting for such an awesome collection of animals.



"Roof Lizard"


Stegosaurus walked on four rather stumpy legs, it had a double line of leaf-shaped plates running down its back. Stegosaurus was the largest of the stegosaurs.



Stegosaurus lived during the Late Jurassic.

Extinct for about: 00,000,000,000 Days00 Hours00 Min00 Sec

How old are you?
00,00,00.00 of your lifetimes have passed since their extinction.

They Call it Home

The Morrison Formation is a long stretch of ancient rock running from Montana, all the way to New Mexico. Amazingly, it had been preserved for the last 150 million years, just waiting for a palaeontologist to uncover its ancient wonders. For palaeontologists, it is a Jurassic playground - its treasures include fossils of AllosaurusDiplodocusBrachiosaurus and Apatosaurus.

Vast Plains

Vast Plains

Rivers / Lakes

Rivers / Lakes




  • Western North America
  • Wyoming
  • Utah
  • Colorado
  • Portugal

What We Heard About Their Hearing

Human Ear

There is still much to discover aboutStegosaurus' sense of hearing.


What Big Teeth You Have

Dinosaur Tooth

Stegosaurus' teeth were small, triangular and flat.


Nose Knowledge

Human Nose

Stegosaurus may have had an excellent sense of smell for smelling out its fragrant food choices.


The Poop Scoop

Dinosaur Poop

Palaeontologists know very little about the toilet habits ofStegosaurus.


The Most Fantastic Find

In 2007, Fernando Escaso, from Madrid University, led a team of Spanish and Portuguese scientists, to the dinosaur rich Casal Novo in Portugal. The team struck lucky unearthing the very first Stegosaurus fossil to be found outside of North America. This led scientists to believe that there may have been a walkway between the two continents during the Jurassic. A Stegosaurus could have literally been able to go from America to Europe in one small step.

From The Expert

In addition to the flat plates along its back, Stegosaurus also boasted a double set of fierce spikes on its tail. A recent study using advanced computer modelling shows that the tail of stegosaurs was flexible enough for the spikes to be swung at fast speeds, like a medieval mace. This would have been a useful weapon against predators.


Sizing it Up


Compare to:

3.7m / 12.14ft

Stegosaurus was as big as an elephant.

1 human
1 human
3.7 m / 12.14 ft


Number of people head-to-toe to reach the top of Stegosaurus. (average human height 1.76 m / 5.7 ft)

Compare to:

9m / 29.52ft

Stegosaurus was 1/3 the size of Diplodocus.

1 human
1 human
9 m / 29.52 ft


Number of people side by side touching finger tips to match this length (average arm span 1.7 m / 5.58 ft ).

Compare to:

3.0tonnes / 3.36short tons

Stegosaurus was twice as heavy as a car.

stegosaurus weight

Number of people weighing 70.31 kg / 155 lbs needed to match the weight of Stegosaurus.


Dino On The Go!

The top speed of Stegosaurus.

6kph / 3.73mph

  • Horse 52 kph / 32.3 mph
  • Stegosaurus6 kph / 3.73 mph
  • Cheetah 120.7 kph / 75 mph

22.5kph / 14mph

The average human sprint speed.


Family Album

Family Album

Stegosaurus was a member of the subgroup of dinosaurs called Ornithischia: the bird hipped dinosaurs. They were herbivores but much smaller than the long-necked sauropods. Stegosaurs are closely related to the ankylosaurs and more distantly related to Triceratops.



Stegosaurus Vision

Stegosaurus not only had a small brain but also had poor eyesight. They were not very clever animals.

Stegosaurus Vision.

Human Vision

The human field of view is roughly 180 degrees.

Human Field of View

The Skinny On Their Skin


Stegosaurus probably had tough, scaly skin. Prehistoric armour in a Jurassic battleground.

Stegosaurus had dermal plates rising from its skin like sails - the largest plates were a massive 60 cm (23.6 in) wide and 60 cm (23.6 in) tall giving it added height and grrr power!


What's In The Nest?

Stegosaurus Egg

Stegosaurus eggs have never been found by scientists though we are pretty sure they laid eggs in nests on the ground like all the other dinos. 



stegosaurus brain size

Stegosaurus had a brain the size of a kitten's (even though its body weighed as much as 2,756 kittens).


Quite The Bite

Stegosaurus had a bite force of 140.1 N, which is less than half the bite force of a labrador. It didn't need a big bite for its vegetarian lunch.

Stegosaurus Bite
  • Alligator
  • Lion
  • Leopard
  • Stegosaurus

    Bite Force (N)


    Average force of human bite, measured at molars.


    Good Eatin'

    Plant Icon

    Stegosaurus was first thought to have been bipedal because of its extremely short forelimbs but they would have actually allowed it to graze low to the ground.

    Stegosaurus was a dedicated plant eater and would have spent most of its time eating mosses, ferns, horsetails, cycads and conifers.


    Parental Guidance

    Stegosaurus Parent and Child

    Stegosaurus may have liked to live in herds moving about with their young by their side.


    True Colours

    Color Wheel

    We don't quite know, so traditional dinosaur illustrations are our best guide! We do know that the plates of Stegosaurus could have been used in threat or courtship displays and they may have had the ability to "blush" red when flushed with blood.