Spinosaurus vs Mosasaurus: Who Would Win in a Fight?

Written by August Croft
Published: May 26, 2022
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In an imaginary fight between a spinosaurus vs mosasaurus, who would reign supreme? Given the fact that the spinosaurus primarily exists on land, while the mosasaurus primarily exists in water, how does this affect a battle between the two creatures? Let us imagine what might happen in a fight between these two dinosaurs today. 

In this article, we will compare and contrast the mosasaurus with the spinosaurus so that we can get a true understanding of both of these creatures. In addition, we will go over their offensive and defensive capabilities to try and determine a winner in this imaginary fight. Let’s get started and go over all of this information in more detail now! 

Comparing Spinosaurus vs Mosasaurus

Spinosaurus vs Mosasaurus
The spinosaurus is longer than the mosasaurus, though the mosasaurus weighs more than the spinosaurus on average.
SpinosaurusMosasaurus
Size45-60 feet long; 10-15 tons35-55 feet long; 20-25 tons
Speed10-15 mph on land20-30 mph in water
OffenseBite force of nearly 20,000 psi, with a jaw full of over 60 sharp teeth. Classic ambush predator, often attacking creatures at the water’s edge; considered semi-aquatic for this reason, though still lived primarily on landLarge and powerful jaw full of 40-60 teeth; bite force of up to 16,000 psi and quick bursts of speed make it a fantastic ambush predator. Can change direction easily in the water
DefenseCapable of fleeing on land as well as swimming short distances in the waterTough skin and high intelligence allows for many advanced maneuvers and defenses
Endurance and BehaviorHigh endurance on land, but doesn’t have the highest intelligenceNeed to breathe air, but capable of traveling great distances quickly

Key Differences Between Spinosaurus vs Mosasaurus

Spinosaurus vs Mosasaurus

The bite force of the spinosaurus is stronger than that of the mosasaurus.

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©Herschel Hoffmeyer/Shutterstock.com

There are a number of key differences between the spinosaurus and the mosasaurus that greatly affect the outcome of this battle. For example, the spinosaurus is longer than the mosasaurus, though the mosasaurus weighs more than the spinosaurus on average. Additionally, the bite force of the spinosaurus is stronger than that of the mosasaurus, though the mosasaurus had higher intelligence than the average spinosaurus. 

This is not enough information to determine the winner of this battle. Let’s take a closer look at everything you need to know in more detail now. 

Spinosaurus vs Mosasaurus: Size

Spinosaurus vs Mosasaurus
The average spinosaurus reached 45 to 60 feet in length, while the average mosasaurus only reached 35 to 55 feet long.

One of the main contributing factors in a fight between two dinosaurs has to be size. When it comes to the size of the spinosaurus versus the mosasaurus, the spinosaurus grows longer than the mosasaurus overall. However, the mosasaurus weighs more than the spinosaurus, making this a more even fight. Let’s take a closer look at the figures now. 

The average spinosaurus reached 45 to 60 feet in length, while the average mosasaurus only reached 35 to 55 feet long. However, the mosasaurus weighed an average of 20 to 25 tons, while the spinosaurus only weighed 10 to 15 tons. This is a significant weight difference, and likely means that the spinosaurus has a difficult time taking down the average mosasaurus. 

When it comes to size, these two dinosaurs are equally matched. 

Spinosaurus vs Mosasaurus: Speed

Spinosaurus vs Mosasaurus

The spinosaurus reached 10 to 15 mph, while the mosasaurus frequently reached 20 to 30 mph.

©Herschel Hoffmeyer/Shutterstock.com

Speed is an extremely important consideration in a fight between the spinosaurus and the mosasaurus. Both of these dinosaurs are extremely fast and agile for their size, though they are the most agile in their preferred terrains. For example, the mosasaurus existed in water, while the spinosaurus existed primarily on land. So, when it comes to speed and the outcome of this fight, it truly depends on where the fight begins. 

Despite this, the mosasaurus had a faster top speed compared to the spinosaurus. For example, the spinosaurus reached 10 to 15 mph, while the mosasaurus frequently reached 20 to 30 mph. So, if a fight did indeed happen in the water, the mosasaurus would have the advantage over the spinosaurus, hands down

Spinosaurus vs Mosasaurus: Offensive Powers

Spinosaurus vs Mosasaurus

The spinosaurus frequently hunted along the edges of rivers or lakes, ambushing prey that lived in water, which is where the mosasaurus lived.

©Michael Rosskothen/Shutterstock.com

Offensively, it is another close match between the spinosaurus and the mosasaurus. Both of these dinosaurs had rows of extremely sharp teeth, though the bite force of the spinosaurus was higher than the bite force of the mosasaurus. Additionally, both of these creatures were ambush predators, capable of rushing their prey and latching onto them with their powerful jaws. 

However, the spinosaurus frequently hunted along the edges of rivers or lakes, ambushing prey that lived in water, which is where the mosasaurus lived. It is entirely possible that the spinosaurus would win in an offensive fight, given its familiarity with ambushing aquatic prey like the mosasaurus. 

Spinosaurus vs Mosasaurus: Defensive Powers

Spinosaurus vs Mosasaurus

Research suggests that the Mosasaurus was highly intelligent, while the spinosaurus was not considered particularly wise. 

©Mercury Green/Shutterstock.com

When it comes to the defensive techniques of both of these dinosaurs, it is another close call. It all depends on how the battle plays out in terms of strategy, which may give the mosasaurus an advantage over the spinosaurus. Research suggests that the Mosasaurus was highly intelligent, while the spinosaurus was not considered particularly wise. 

So, if the mosasaurus was a quick thinker in this fight, it may have the advantage over the spinosaurus in terms of defense. 

Spinosaurus vs Mosasaurus: Endurance and Behavior

Spinosaurus vs Mosasaurus

The mosasaurus needs to breathe air in order to survive, which means that the spinosaurus could indeed drown the mosasaurus with little effort.

©Dotted Yeti/Shutterstock.com

It is difficult to determine a winner when it comes to the endurance and behavior of both the spinosaurus and the mosasaurus. This is primarily the case because they live in different environments for most of their lives. However, given the fact that the spinosaurus frequently hunts dinosaurs along the edges of waterways, they may end up winning in a fight against the mosasaurus. 

Additionally, the mosasaurus needs to breathe air in order to survive, which means that the spinosaurus could indeed drown the mosasaurus with little effort. However, the same could be said in the opposite direction, if a spinosaurus chose to engage a mosasaurus in battle in a body of water rather than on land. 
Given the huge differences in environments and strategy with both of these creatures, it would be an extremely close battle between a spinosaurus and a mosasaurus. There’s no way for us to call a fight like this, given just how unique both of these dinosaurs were!

The photo featured at the top of this post is © Mercury Green/Shutterstock.com


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About the Author

August Croft is a writer at A-Z Animals where their primary focus is on astrology, symbolism, and gardening. August has been writing a variety of content for over 4 years and holds a Bachelor of Fine Arts Degree in Theater from Southern Oregon University, which they earned in 2014. They are currently working toward a professional certification in astrology and chart reading. A resident of Oregon, August enjoys playwriting, craft beer, and cooking seasonal recipes for their friends and high school sweetheart.

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