An Argentinosaurus' osteoderms would have been the largest ever known - the size of a gym bag!

Argentinosaurus is one of hundreds of unusual dinosaurs found in Argentina, one of the richest countries in the world for fossil discoveries.

Argentinosaurus were probably able to rear up on their hind legs. Imagine a 100 tonne dinosaur smashing back down to Earth with a thud!

Just one of Argentinosaurus' vertebrae measured 1.5m (5ft) long - that's as tall as a person.



"Argentina's Lizard"


Argentinosaurus was most probably the largest land animal ever to walk the planet. Like other sauropod dinosaurs, it had a long neck and long tail. It was the king of all sauropods.



Argentinosaurus lived during the Late Cretaceous, 94 million years ago.

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

Argentinosaurus lived in an arid environment with a wet season.



Seasonal Streams

Seasonal Streams




  • Argentina (Huincul Formation)

What We Heard About Their Hearing

Human Ear

We don't know anything about Argentinosaurus hearing because no skull has ever been uncovered. 


What Big Teeth You Have

Dinosaur Tooth

Argentinosaurus would probably have had weak jaws with pencil-like teeth for stripping the leaves off conifer trees. Unfortunately, we do not know for sure because no skull has ever been found.


Nose Knowledge

Human Nose

We don't know much about Argentinosaurus' sense of smell.


The Poop Scoop

Dinosaur Poop

Argentinosaurus had an estimated poop volume of 15 litres (26 pints). Their excrement probably covered an impressive area, especially when dropped from a height. 


The Most Fantastic Find

Argentinosaurus fossils were first uncovered by a South American rancher named Guillermo Heredia who discovered a vertebra in 1987. It was so massive (as tall as a person) that he mistook it for a piece of petrified wood. It wasn't until 1993 that José F. Bonaparte identified these bones as coming from a dinosaur. Argentinosaurus fossils are national treasures in Argentina so you'll never find this titanosaur's bones anywhere else. 

From The Expert

The humongous measurements of Argentinosaurus are estimates calculated by comparing its fragmentary bones to those of relatives known from complete skeletons. Would theropods like Mapusaurus even attempt to prey on an Argentinosaurus? Maybe - but probably only on the young and weak. 


Sizing it Up


Compare to:

8m / 26.24ft

Almost as tall as a three-storey building.

1 human
1 human
8 m / 26.24 ft


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

Compare to:

37m / 121.36ft

Argentinosaurus was as long as a Boeing 737 aircraft. 

1 human
1 human
37 m / 121.36 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:

100.0tonnes / 112.0short tons

Argentinosaurus was eight times heavier than Diplodocus.

argentinosaurus weight

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


Dino On The Go!

Titanosaurs like Argentinosaurus had a broader walking stance than other sauropods. 

4.9kph / 3.04mph

  • Horse 52 kph / 32.3 mph
  • Argentinosaurus4.9 kph / 3.04 mph
  • Cheetah 120.7 kph / 75 mph

22.5kph / 14mph

The average human sprint speed.


Family Album

Family Album

Argentinosaurus was a sauropod. These were large herbivorous dinosaurs with long necks and long tails, just like Diplodocus. More specifically, Argentinosaurus was a titanosaur, the largest of the sauropod group.



Argentinosaurus Vision

Argentinosaurus probably had eyes on either side of its head, like its sauropod relatives.

Argentinosaurus Vision.

Human Vision

The human field of view is roughly 180 degrees.

Human Field of View

The Skinny On Their Skin


Argentinosaurus probably had scaly armour or 'osteoderms', like modern day crocodiles and armadillos. These osteoderms would have stored minerals for use in maintaining their huge skeletons and producing large clutches of eggs.


What's In The Nest?

Argentinosaurus Egg

Argentinosaurus would have laid eggs about the size of a coconut. Its hatchlings were born weighing just 5kg (11lb) and each one would have taken over 40 years to reach adult size. That's a hell of a childhood!



argentinosaurus brain size

To compete with the clever Velociraptor, which had a big brain for its body size, Argentinosaurus would have needed an enormous brain. It didn't. This gigantic dinosaur would not have been the most intelligent of dinosaurs. 


Quite The Bite

Argentinosaurus would have had weak jaws with pencil-like teeth for stripping the leaves off conifer trees. Unfortunately, we do not know for sure because a skull has never been found.



Good Eatin'

Plant Icon

Argentinosaurus would have eaten plants including prehistoric conifers. It is thought that this massive dinosaur would have had to ingest 100,000 calories a day to reach its adult size - that's the equivalent of 50 whole chocolate cakes or 2,127 apples. 


Parental Guidance

Argentinosaurus Parent and Child

A huge number of Argentinosaurus-like fossilised eggs have been found in a place known as Auca Mahuevo ('huevos' meaning eggs) in Argentina. Here, hundreds of females would have gathered to lay their eggs, possibly covering them in vegetation in order to keep them warm.


True Colours

Color Wheel

We have no idea what colour an Argentinosaurus would have been, but as one of Argentina's national treasures, wouldn't it be nice if they were blue, white and yellow like their flag?