Pachyrhinosaurus had tooth batteries so that worn teeth could be replaced by new ones, like a conveyor belt system. This increased the efficiency by which they chomped on their tough plant material.

New discoveries of Pachyrhinosaurus are being made all of the time. One new species was described in 2011. It was named after Ross Perot, a famous businessman who has funded a number of scientific expeditions and ran for the US presidency twice.

Pachyrhinosaurus and other horned dinosaurs are thought to have fed on newly evolved flowering plants.



"Thick-nosed lizard"


Pachyrhinosaurus was a rhinoceros-like dinosaur with horns, frill, bony ornaments and a beak. 



Pachyrhinosaurus lived during the Late Cretaceous.

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

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00,00,00.00 of your lifetimes have passed since their extinction.

They Call it Home

Pachyrhinosaurus lived in Cretaceous Alaska and Alberta. With some of its range near the poles, these dinosaurs would have experienced long winters and months of darkness. 





Rivers / Lakes

Rivers / Lakes




  • Alberta, Canada
  • Alaska

What We Heard About Their Hearing

Human Ear

With relatively small and primitive hearing apparatus, it is likely that Pachyrhinosaurus would not have had very good hearing.  


What Big Teeth You Have

Dinosaur Tooth

As a herbivore, Pachyrhinosaurus had strong, stubby, cheek teeth. These were packed tightly together to form a single continuous cutting surface for slicing food into small pieces, like a pair of prehistoric scissors. 


Nose Knowledge

Human Nose

Like its hearing apparatus, the olfactory centres of Pachyrhinosaurus were reduced, which means its sense of smell was poor.



The Poop Scoop

Dinosaur Poop

We haven't discovered any Pachyrhinosaurus poo yet.



The Most Fantastic Find

In 1973 at Pipestone Creek, Alberta, Canada, science teacher Al Lakusta discovered hundreds of Pachyrhinosaurus remains. This bone bed suggests that, about 73 million years ago, a herd of juvenile and adult individuals died in a flood. The remains have given us a unique insight into the lifestyle of these animals.


From The Expert

Pachyrhinosaurus fossils are often found with, or near, fossils of the duck-billed dinosaur Edmontosaurus. Both species lived throughout Alberta and into Alaska. It is likely that they shared a similar environmental preference and might have even travelled in herds together.


Sizing it Up


Compare to:

2.5m / 8.2ft

About 1m (3ft) shorter than Stegosaurus 

1 human
1 human
2.5 m / 8.2 ft


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

Compare to:

7m / 22.96ft

Half the length of Tyrannosaurus


1 human
1 human
7 m / 22.96 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

About the same weight as a male white rhino 


pachyrhinosaurus weight

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


Dino On The Go!

The running speed of even the largest of the ceratopsids was probably similar to modern rhinos. Today, rhinos can reach speeds of up to 45kph (28mph).


45kph / 27.96mph

  • Horse 52 kph / 32.3 mph
  • Pachyrhinosaurus45 kph / 27.96 mph
  • Cheetah 120.7 kph / 75 mph

22.5kph / 14mph

The average human sprint speed.


Family Album

Family Album

Pachyrhinosaurus is a member of the Ceratopsidae group which includes all quadrupedal, herbivorous dinosaurs with beaks, shearing teeth, elaborate horns and frills, including Triceratops, Torosaurus and Styracosaurus




Pachyrhinosaurus Vision

Pachyrhinosaurus had poor vision. Palaeontologists have studied its brain cavity and found that the optic centre which controls the animal's vision was not well developed.


Pachyrhinosaurus Vision.

Human Vision

The human field of view is roughly 180 degrees.

Human Field of View

The Skinny On Their Skin


Pachyrhinosaurus' skull bore massive reinforced bones - called bosses - over its noses and eyes, most probably for display and head butting rival males. The animal's horns and other bony ornaments were smaller than its bosses and the arrangements differed depending on the species of Pachyrhinosaurus. The frill was also topped with a prominent pair of horns.



What's In The Nest?

Pachyrhinosaurus Egg

Scientists have uncovered a nest from a Protoceratops, a relative of Pachyrhinosaurus. The nest was round in shape, measuring 0.7m (2.3ft) in diameter and containing 15 'baby' dinosaurs. Pachyrhinosaurus would probably have had similar nests.




pachyrhinosaurus brain size

Pachyrhinosaurus had a small, poorly developed brain. It was not a bright animal.



Quite The Bite

Pachyrhinosaurus used its battery of strong cheek teeth to chomp on low-lying tough fibrous plants and its sharp beak to slice vegetation. 




Good Eatin'

Plant Icon

Herds of Pachyrhinosaurus needed vast areas of vegetation in order to sustain their numbers. To get them through the polar months, some scientists believe they might have migrated hundreds of miles to warmer climes.



Parental Guidance

Pachyrhinosaurus Parent and Child

Fossils have been uncovered in which both adults and juveniles are found together, suggesting that Pachyrhinosaurus might have protected its young within a large group, like many herding animals do today.



True Colours

Color Wheel

If the frill of Pachyrhinosaurus was indeed used in display, as many palaeontologists hypothesise, then it might have been colourful to impress mates and intimidate rival males. However, we may never really know.