This article is about the genus Mosasaurus, not to be confused with the mosasaurs, the family with the same name to which Mosasaurus belongs to.

"The Mosasaurus was thought to have hunted near the surface of the water, where it preyed on anything it could sink its teeth into, including turtles, large fish, even smaller mosasaurs."

Mosasaurus was a genus of large aquatic carnivorous lizard from the Late Cretaceous about 70-66 million years ago. Mosasaurus gave its name to a group of marine lizards - Mosasaurs.

Mosasaurus means 'Meuse Lizard', referring to the river near which it was first found. It fed on such prey as seabirds, sharks, large fish, plesiosaurs and even other mosasaurs.

Wikipedia has a more detailed and comprehensive article on Mosasaurus



Mosasaurus consuming a shark while spectators watch.

On August 25, 2000, InGen researchers while testing a prototype iron analyzer discovered traceable DNA fragments on a recently uncovered mosasaur specimen. Dr. Henry Wu believed this to be the only way of recreating aquatic organisms without extracting blood from mosquitoes trapped in amber.[1]

Mosasaurus was successfully recreated by InGen under the wing of the Masrani Global Corporation for their new dinosaur park Jurassic World.[2] The species created was Mosasaurus maximus,[3] which many believe to be synonymous with the species M. hoffmannii, but others believe it to be a valid species.

The cloned Mosasaurus retained many features of its original counterpart. It also had a bite force of 13K, one pound higher than the terrestrial predator Tyrannosaurus rex that lived in the same period as the Mosasaur.[4] The Mosasaurus also had a frill running down its back and lacked a forked tongue as well as lacked a large tail fluke. The clone's colors are mostly greyish-blue with a creamy underbelly.

The Mosasaur lived in a 3 million gallon pool of water located near Main Street[4] known as the Jurassic World Lagoon and visitors could watch it feed on sharks in the Mosasaurus Feeding Show. Visitors could also view her through an aquarium below the lagoon known as the Underwater Observatory to see her.[5]

Size Estimates

Below is a list of size estimates for the cloned Mosasaurus from various sources:

Length Source
16 m (55 ft) [6]
18 m (60 ft) [7][3]
22 m (72 ft) [8]
22 m (72.2 ft) [9]
25.9 m (84.9 ft) [10]
36.6 m (120 ft) [11]

Isla Nublar Incident (2015)

Gray and Zach Mitchell attended the Mosasaur Feeding Show and the Underwater Observatory in which they saw the Mosasaurus consume a shark.

Following the escape of the Jurassic World Aviary's residents from their enclosure, the Mosasaurus devoured a Pteranodon that was flying over its enclosure to capture Zara Young, also eating Zara, who was in the talons of the Pteranodon.

The Mosasaur dragged the Indominus Rex to the bottom of the lagoon, killing the hybrid.

At the end of the battle between the Indominus rex, the park's veteran T. rex, and Blue the Velociraptor, the Mosasaurus beached itself to catch the hybrid in its jaws and dragged it to the bottom of the lagoon, thus killing it.[2]

Jurassic World: Fallen Kingdom

"Relax. Anything in here would be dead by now."
Sub Pilot(src)

It is revealed that the individual Mosasaurus seen in Jurassic World has survived the months it has spent on Isla Nublar. It was thought to be dead when the submarine went in to collect a sample of what was left of Indominus rex. The Mosasaurus then ate the sub, along with a mercenary trying to escape on a helicopter, and when the gates were left open, it escaped the lagoon and swam into the ocean. It was last seen trying to eat surfers off of a coast.

A Rising Tide

The Mosasaurus plays a central role in the motion comic, which tells the story of its attack on surfers on the north shore of Oahu, Hawaii depicted at the end of Jurassic World: Fallen Kingdom.

Battle at Big Rock

Mosasaurus makes a brief cameo in the short, eating a breaching great white shark during the end credits.

Jurassic World: Dominion

The Mosasaurus is likely to return in the upcoming film Jurassic World: Dominion




Promotional Images

Jurassic World

Jurassic World: Fallen Kingdom

Battle at Big Rock

Jurassic World: Camp Cretaceous


All video games released before Jurassic World have outdated depictions of Mosasaurus showing it without a tail fluke and lacking the color scheme that all mosasaurs might have had in real life, which was black with a white underbelly.

Jurassic Park III: Park Builder

Mosasaurus is number 126 of the Carnivore Threes that can be created in Jurassic Park III: Park Builder.

Jurassic Park: Builder

see Mosasaurus/Builder

In Jurassic Park: Builder Mosasaurus can be created in the aquatic section of the park as a limited edition dinosaur.

Jurassic World: The Game

see Mosasaurus/JW: TG

In Jurassic World: The Game, Mosasaurus is a legendary surface sea reptile. At first, it could only be seen swimming in the Jurassic World Lagoon without the player being able interact with it, create it, or use it in the battle arena. This was until September 30, 2015 when the Mosasaurus appeared. Since then, the shadow in the lagoon has disappeared until you get the mosasaur. It was only available in either winning it in the Mosasaurus tournament or win it by spinning the tournament wheel and landing on it, but it now can be obtained by either purchasing an Aquatic Card Pack, or winning an Aquatic Card Pack that contains it from the arena.

LEGO Jurassic World

Mosasaurus appears in the video game LEGO Jurassic World. It is depicted with dark blue skin and a gray underbelly. It also lacks a tail fluke and moves in a snake-like motion like older restorations. This probably because there is no LEGO element at the time that resembles a mosasaur tail fluke.

The Mosasaurus first appears in the level "Under Attack" where it eats Zara, like in the Jurassic World film. The second appearance of the Mosasaurus is in the final cutscene to the level "Main Street Showdown" where it lunges out of the water and grabs the Indominus. The Mosasaurus' final appearance in the game's story is in the end cutscene to the Jurassic World levels where it is seen swimming under the helipad that carried the chinook that Dr. Henry Wu escaped in as the Indominus rex, Zara, and several Jurassic World workers play a game of cards inside the Mosasaur's stomach.

Its amber, as well as the boneboxes that construct its skeleton, are found in the level "Main Street Showdown". Its amber is found in the Hammond Creation Lab to the left inside the Innovation Center that has an InGen panel for a lock that can only be opened by characters such as Simon Masrani or John Hammond and is found in the "Extraction Room" where a character who can access a hand scanner can free it from its glass case. The Moasasaurus can only be spawned in the Underwater Observatory.

As a playable creature, the Mosasaurus is able to let out a low roar that can smash amber bricks like large theropods, such as Tyrannosaurus rex can do.

LEGO Dimensions

The Mosasaurus appears in the Jurassic World dimension. The crane used to feed it can be purchased for the dimension, which the player can activate. Unlike in the previous LEGO game it appeared in and Jurassic World it is fed a turkey rather than a shark. The model for the Mosasaurus in the game is reused from LEGO Jurassic World.

Jurassic World

A figure of Mosasaurus packaged with a human in a mini-submarine-like vehicle was released as a part of Hasbro's Jurassic World toy line. It can snap its jaws by pressing down a button located on its back and a piece of its skin can be pulled back to reveal a wound.

A "Chomper" toy was made of Mosasaurus. It can snap its jaws by pushing down on its back fins.

Mosasaurus also had a plush toy made of it.

Jurassic World: Fallen Kingdom

A new figure of Mosasaurus was released as part of the toyline for Jurassic World: Fallen Kingdom. This figure will have a rubbery "real-feel" skin texture on its body.

Behind the scenes

Concept art for breeding tank (done by Ricardo Delgado)

Concept art of the Mosasaurus Feeding Show featuring the Mosasaurus.

Before making a physical appearance in Jurassic World, there was an idea for Jurassic Park III to feature a mosasaur breeding tank.[12] It was included in the first draft of the script and had concept art done, but was removed in later versions of it.[13]

Mosasaurus in the Jurassic World storyboard.

In the Jurassic World storyboard, Mosasaurus was to be depicted with a serpentine body lacking a tail fluke like pre-2014 restorations and had horizontal stripes covering its body which mosasaurs did not have. The Mosasaurus' involvement in the pterosaur attack was to be different as well. Originally, during the pterosaur attack, the monorail that went over the lagoon was to collapse during the attack, dangling over the mosasaur's habitat. When a Pteranodon trying to kill a passenger desperately hanging onto the rapid transit vehicle, the Mosasaur lunges out of the water pulling the Pteranodon down into the water and the monorail with it. Several Pteranodons then proceed to attack the marine reptile in an attempt to save their own, but ultimately the Mosasaurus gets away with its kill. [14]

Concept art.

One early concept of the Mosasaurus' enclosure was a Shark tunnel and in that concept, the Mosasaur was eating a person (possibly having fallen during the pterosaur attack) in the presence of parkgoers.[15] Jurassic World director Colin Trevorrow later came up with the idea of the Mosasaurus Feeding Show during one of his first meetings with Steven Spielberg and Frank Marshall. He mentions that in his original concept there is a separate facility that mass-produces the sharks the Mosasaurus eats via cloning.[16]

Paul Liaw of Industrial Light and Magic who sculpted the Mosasaurus 3D model used turtles, crocodiles, whales, and other animals he could find on the internet as references when creating its underbelly and back. ILM purposely made the Mosasaur in Jurassic World larger than its real life counterpart to make it look big enough for the final fight with Indominus rex at the end of the film.[17]

The Mosasaurus' sounds were a mix of walruses and beluga whales to give the Mosasaur weight as well as to make it more of a marine animal and not a land animal.[18]

The scene of the Mosasaurus feeding in Jurassic World changed a total of 3 times out the course of the Jurassic World trailer releases.

Changes made to the Mosasaurus feeding throughout the trailer releases of Jurassic World.

It is commonly believed that the mosasaur that appeared in Jurassic Park: The Game is Mosasaurus, but the InGen Field Journal classifies the mosasaur created for Jurassic Park as Tylosaurus.[19]

To celebrate the home release of Jurassic World in the United Kingdom on October 19, 2015, Wild Creations (who had previously created animatronic versions of the Jurassic World Velociraptor Pack in the Waterloo Station to promote the film's release in June) created a 7 meter high model of a Mosasaurus preparing to eat a shark and placed it in London's South Bank.[20]


  2. 2.0 2.1 Jurassic World
  3. 3.0 3.1 RaptorPass 10 Mosasaurus
  4. 4.0 4.1 - Mosasaurus Feeding Show Retrieved from
  5. - Play Retrieved from
  6. 10 - Animals of Jurassic Park.jpg Infographic from the Innovation Center.
  8. Jurassic World: Where Dinosaurs Come to Life
  9. The Park is Open
  10. DPGMosasaurus.jpg Dinosaur Protection Group image.
  11. Cinefex Article
  12. Delgado, Ricardo F. (May 12, 2013) Jurassic Park 3 breeding tank idea. Blogspot.
  13. (June 10, 2001) Johnston on Underwater Dinos, Spielberg's JP3 Idea. Dan's JP3 Page (excrepted from the July 2001 issue of Movieline magazine).
  14. davelowerystoryboards - Jurassic World (July 31, 2015) Retrieved from
  15. Jurassic World Target Exclusive Edition featurette - "The Experts"
  16. Empire Magazine - Empire's Jurassic World Trailer Tour: Page 9. Retrieved from
  17. - Interview: ILM on Jurassic World (Febuary 3, 2016) Retrieved from
  19. InGen Field Journal, page 23
  20. Digitial Spy - Watch out! Jurassic World's Mosasaurus comes to life in London (October 19, 2015) Retrieved from


Jurassic World Dinosaurs
AnkylosaurusApatosaurusDimorphodonGallimimusIndominus rexMosasaurusPachycephalosaurusParasaurolophusPteranodonStegosaurusTriceratopsTyrannosaurus rexVelociraptor
Jurassic World: Fallen Kingdom Dinosaurs
AllosaurusAnkylosaurusApatosaurusBaryonyxBrachiosaurusCarnotaurusCompsognathusGallimimusIndoraptorMosasaurusParasaurolophusPteranodonSinoceratopsStegosaurusStygimolochTriceratopsTyrannosaurus rexVelociraptor

Battle at Big Rock Dinosaurs
Community content is available under CC-BY-SA unless otherwise noted.