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Spinosaurus aegyptiacus : bipedal or quadrupedal ?

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May-05-2017 1:38 PM

Spinosaurus was the largest theropod to ever walk on the earth, discovered in 1912 for the first time, it has been nominated to be larger than the mighty tyrannosaurus rex.

This giant theropod was suggested to be between 12.6–18 metros long (41–59 ft) and 4.25-5 meters tall, even new evidence has came to light to show that it was smaller than this...

this one is the original spinosaurus skeleton, larger than most of the other adult ones but strangely it's bones are thinner , his skull was long but fragile, with a bite estimated to be between 1-2 tons ( it's very difficult to determine a spinosaurus bite force).

This skeleton has proven that spinosaurus was bipedal too, even in 2014 something different has been found...

An a passionated paleontologist, named Ibrahim decided to paste all the bones of a new found spinosaurus and this was the final result :

this reconstruction was way different than the original one and from that moment it started to think that spinosaurus was not bipedal, but quadrupedal , also it has been proven that spinosaurus was not a dinosaur hunter, but a fish eater which spent most of the time in water as a crocodile.

here there is the 2014 reconstruction of spinosaurus :

so with this new evidence, spinosaurus wasn't  considered to be the biggest theropod ever (in terms of height and size, it was still the longest).

In 2015-16 all this has been debunked because some paleontologists started think that left legs of spinosaurus were incomplete and to prove that it is real we need to find more skeletons like this, even there are some others quadrupedal exemplars skeletons.

So for once again spinosaurus is bipedal, but not as the jurassic park 3 one which is very inaccurate.

but still considered to be a fish eater because his jaws were designed to catch fishes and his body was adapted to swim.       Even the quadrupedal theory is debunked, I personally think that there is a chance that spinosaurus may have been quadrupedal, maybe by an evolution or another specie of spinosaurus, don't judge me because it is just my own opinion.

Leave a comment of what do you think and share your opinion if you want !

So in your opinion... was spinosaurus bipedal

or was it quadrupedal ?

I wait for your answer :)

In nature, or you kill...or you get killed -Jack London

9 Responses to Spinosaurus aegyptiacus : bipedal or quadrupedal ?

I Meme Everything

May-05-2017 1:38 PM

Bipedal, but still pretty short

"Part of the journey is the end..."

I Meme Everything

May-05-2017 1:39 PM

Also, T.rexCarcharodontosaurus, and Giganotosaurus are larger

"Part of the journey is the end..."


May-05-2017 2:00 PM

Well , based on facts there are more chances that it was bipedal so I agree ;) but spino was the largest by length and height, tyrannosaurus , carcharodontosaurus and giganotosaurus are larger in weight

In nature, or you kill...or you get killed -Jack London

Sci-Fi King25

May-05-2017 4:54 PM

In my opinion it walked like this-





“Banana oil.”- George Takei, Gigantis: The Fire Monster

I Meme Everything

May-05-2017 5:12 PM


"Part of the journey is the end..."


May-05-2017 10:55 PM

Yeah that could be an accurate way I agree

In nature, or you kill...or you get killed -Jack London

Jurrasic Park is Inaccurate

Jun-23-2018 4:25 PM

I personally don't know if it was Bipedal or not.

But I do have one question, why are both of my skeletons drastically different? They have to be different species of Spinosaur or something like that. 

I Meme Everything

Jun-23-2018 5:23 PM

^The original assumption of S.aegyptiacus was that it had a full, semi-circular sail and it walked on two legs. New fossils show that the sail dipped down in the middle and its legs were shorter.

"Part of the journey is the end..."


Jun-23-2018 10:39 PM

Looking at both fossil photographs in the OP it looks to me that the second, smaller fossil may be that of a juvenile, especially when you look at the difference in grandeur of the sail and the skull. IMO, this may suggest that young Spino's are primarily quadrupeds but as they mature they shift to a more upright posture becoming both quadrupedal and bipedal as adults, much like many Parasaurs.

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