Revealing 25 Prehistoric Animals That Are Not Dinosaurs

Leave a comment / / Updated on: 18th December 2023

Revealing 25 Prehistoric Animals That Are Not Dinosaurs

When most people think of prehistoric animals, their mind immediately goes to dinosaurs

That’s expected since dinosaurs were the most abundant and diverse animal group during the Mesozoic Era

However, several other impressive animals evolved before the dinosaurs or lived alongside these prehistoric beasts. 

Even after the dinosaurs went extinct 66 million years ago, several other notable animal groups evolved to occupy the niches left behind by the Mesozoic lizards. 

In this post, we’ll explore some of the most notable animals that have lived throughout Earth’s history. 

Gage Beasley's Prehistoric Shirt Collection
Gage Beasley’s Prehistoric Shirt Collection
Gage Beasley's Prehistoric Plush Collection
Gage Beasley’s Prehistoric Plush Collection

How We Selected These Prehistoric Animals 

The prehistoric animals that can potentially make this list are inexhaustive. 

Apart from dinosaurs, there have been countless other reptiles, mammals, fish, insects, and shelled animals that qualify as prehistoric animals because of how long ago they lived. 

But for this article, we have selected some of the largest animals that were among the most dominant species in their respective ecosystem. 

Mammoths are one of the most popular prehistoric species
Mammoths are one of the most popular prehistoric species – Daniel Eskridge via Istock

The list includes predators as well as herbivores that dominated the terrestrial or aquatic landscape during the period that they occupied the planet. 

More specifically, we have included popular animals whose names come up a lot in conversations about prehistoric animals, so much so that people sometimes mistake them for dinosaurs. 

Our list also cuts across various prehistoric times from the current Cenozoic Era to as far back as the Paleozoic before dinosaurs even evolved. 

Read on to discover 25 notable prehistoric animals that were not dinosaurs. 

25. Megalodon

Gage Beasley Prehistoric’s Megalodon Concept
Name MeaningGian Tooth
EraCenozoic – Neogene Period
ClassificationChondrichthyes, Lamniformes, Otodontidae
Length15 to 18 meters (49–59 feet)
Weight65 metric tons (about 143,000 lbs)
LocationNorth and South America, Europe, Africa, and Asia

Most people are familiar with the Megalodon—the biggest and most ferocious shark species ever discovered. 

Interestingly, the existence of this massive shark isn’t as far in the past as some people might like to think. 

Until about 2.6 million years ago, the Megalodon still ruled warm oceans across the world. 

This colossal shark had massive teeth that could grow over seven inches long, and it could exert a powerful bite force of 40,000 pounds per square inch.

That’s higher than the bite force of top predatory dinosaurs like the T. rex and many other carnivores throughout history. 

24. Smilodon

Gage Beasley Prehistoric's Smilodon Concept
Gage Beasley Prehistoric’s Smilodon Concept
Name Meaning“Knife tooth”
EraCenozoic – Quaternary 
ClassificationCarnivora, Feliformia, Felidae
Height1 meter (3.3 feet)
Length1.5–2.5 meters (5–8 feet)
Weight160–280 kilograms (350–620 pounds)
LocationNorth America and South America

The Smilodon is the representative of the saber-toothed cats, a group of catlike carnivores known for their elongated blade-like upper canines that grew prominently out of their jaws. 

Smilodon was one of the biggest and best-known members of this group. 

It lived in the grasslands, forests, and savannahs of North and South America during the Pleistocene Epoch and was alive until about 10,000 years ago. 

Smilodon was about the same size as some of the big cats today but with a more robust and muscular build. 

It was just as efficient as a predator, specially adapted to take down large prey in its ecosystem. 

Smilodon lived in grasslands, forests, and savannahs across North and South America.

23. Woolly Mammoth

The Woolly Mammoth
The Woolly Mammoth – CoreyFord via Istock
NameWoolly Mammoth
Name Meaning“Mammuthus primigenius”
PronunciationWOOL-ee MAM-uhth.
EraCenozoic – Quaternary 
ClassificationMammalia, Proboscidea, Elephantidae
Height4 meters (13 feet)
Length6–7 meters (20–23 feet)
Weight6,800 to 8,000 kg (15,000 to 18,000 pounds)
LocationNorth America, Eurasia, and Beringia

Elephants are the biggest land mammals today, but long before they came on the scene, their ancestors, such as the woolly mammoths, dominated the terrestrial landscapes of the Holocene Epoch. 

They lived in the cold tundra of North America, Europe, and Asia until about 4,000 years ago and were part of Earth’s Megaherbivores during the Last Ice Age. 

These large, shaggy elephants were herbivores. 

They were just about the same size as present-day African elephants but were equipped with long, curved tusks and a thick coat of fur to withstand cold temperatures. 

22. Deinosuchus

Gage Beasley Prehistoric's Deinosuchus Concept
Gage Beasley Prehistoric’s Deinosuchus Concept
Name Meaning“Terrible crocodile”
EraMesozoic – Late Cretaceous
ClassificationCrocodylomorpha, Crocodilia, Alligatoridae
Length10–12 meters (33–39 feet)
Weight2.5–8.5 metric tons (55,11.56–18,739 pounds)
LocationNorth America (United States)

Several crocodilians lived alongside the dinosaurs throughout most of the Mesozoic Era. 

Some of them, like the Deinosuchus, grew to massive sizes that would have rivaled some of the biggest dinosaurs around. 

With an average weight of up to eight tons, the Deinosuchus was almost twice as large as some of the largest tyrannosaurid dinosaurs of the late Cretaceous Period. 

Fossil evidence also suggests that this massive crocodile may have preyed on some dinosaurs. 

But the bulk of its diet most likely included fish, reptiles, and other small animals. 

21. Megatherium (Giant Ground Sloth)

Gage Beasley Prehistoric's Megatherium Concept
Gage Beasley Prehistoric’s Megatherium Concept
Name Meaning“Great beast”
EraCenozoic – Quaternary 
ClassificationXenarthra, Pilosa, Megatheria
Height2.1 meters (6 feet 11 inches)
Length6 meters (20 feet)
Weight4 tons (8,800 pounds)
LocationSouth America and North America

The giant sloths are the much bigger and more majestic ancestral cousins of present-day sloths. 

They flourished throughout the Pleistocene Epoch before going extinct about 10,000 years ago. 

Megatherium was an elephant-sized herbivore that browsed vegetation with its powerful forelimbs and large claws. 

It was primarily found in North and South America, inhabiting diverse environments such as grasslands, forests, and swamps.

Unlike tree sloths today, the massive size of the Megatherium meant it could not climb trees. 

But it was quite agile on land and capable of both bipedal and quadrupedal motion, 

20. Ichthyosaurus 

Ichthyosaurus communis
Ichthyosaurus communis / Nobu Tamura – License
Name MeaningFish Lizard
EraMesozoic – Triassic
ClassificationSauropterygia, Ichthyosauria & Ichthyosauroidea
DietCarnivorous, primarily piscivorous
Length4 meters (13 feet)
Weight250 to 500 kg (550 to 1,100 lbs)
LocationEurope (England, Germany), North America (Unites States)

Ichthyosaurus is one of the best-known members of the ichthyosaur group—a family of marine reptiles that roamed the Earth’s oceans from the Triassic to the Cretaceous Period. 

The Ichthyosaurus itself lived during the Jurassic Period

Although it looked a lot like modern dolphins, Ichthyosaurus was neither a fish nor a marine mammal. 

Instead, it was a reptile that developed a wide range of adaptations that made it possible to survive in the marine ecosystem. 

The “fish lizard” preyed on fish and squid-like invertebrates in its ecosystem. 

When fossils of the Ichthyosaurus were discovered in the 19th century, it was the first animal to be known from complete fossils. 

19. Doedicurus

Gage Beasley Prehistoric's Doedicurus Concept
Gage Beasley Prehistoric’s Doedicurus Concept
Name Meaning“Stout tail”
EraCenozoic – Quaternary 
ClassificationMammalia, Xenarthra, Glyptodontidae
Height1.5 meters (4 feet 11 inches)
Length3.6 meters (12 feet)
Weight1,400 kilograms (3,100 pounds)
LocationSouth America

The Doedicurus is what you’d have if present-day armadillos weighed up to 1,400 kilograms (3,000 pounds) and had a massive spiked tail club. 

This armored herbivore lived in South America during the Pleistocene Epoch. 

It is the largest member of a large group of armadillo ancestors known as the glyptodonts that were widespread during the Pleistocene. 

Glyptodonts first evolved about 46 million years ago and were alive until about 10,000 years ago. 

Their massive, bony shell was made up of small bony plates that resembled a suit of armor and provided protection from predators in their ecosystem. 

18. Quetzalcoatlus

Gage Beasley Prehistoric's Quetzalcoatlus Concept
Gage Beasley Prehistoric’s Quetzalcoatlus Concept
Name Meaning“Named after the Aztec god Quetzalcoatl”
EraMesozoic – Late Cretaceous
ClassificationPterosauria, Pterodactyloidea, Azhdarchidae
DietCarnivorous or piscivorous
Height3–4 meters (10–13 feet)
Wingspan10–12 meters (33–39 feet)
Weight200–250 kilograms (440–550 pounds)
LocationNorth America (United States)

While the dinosaurs ruled the terrestrial landscape during the Mesozoic, massive flying reptiles like the Quetzalcoatlus dominated the skies. 

It was a pterosaur that lived during the Late Cretaceous Period, around 68 to 66 million years ago, and was one of the largest of them around. 

This giant pterosaur had a wingspan of up to 36 feet, making it one of the largest flying creatures to have ever lived. 

The largest species in the genus (Q. northropi) would have been as big as a Cessna 172 light aircraft.

Quetzalcoatlus patrolled the coastlines and open plains of North America. 

It fed mainly on fish but was capable of hunting larger prey and may have been a scavenger as well. 

17. Diprotodon

Diprotodon lived during the Pleistocene epoch, which lasted from about 2.6 million to 11,700 years ago
Diprotodon lived during the Pleistocene epoch, which lasted from about 2.6 million to 11,700 years ago | Dmitry Bogdanov via Wikimedia Commons CCA 3.0
Name Meaning“Two forward teeth”
EraCenozoic – Quaternary 
ClassificationMammalia, Diprotodontia, Diprotodontidae
Height1.8 meters tall
Length2,700 kilograms (about 3 tons) 
Weight2,700 kilograms (about 3 tons) 

Diprotodon was a massive marsupial closely related to wombats and koalas. 

It is regarded as the largest marsupial to have ever lived based on current fossil records. 

It is also the only marsupial made to have formed large herds and migrated seasonally in search of food and favorable habitats. 

Diprotodon roamed the plains, grasslands, and forests of Australia during the Pleistocene Epoch from 1.6 million to 46,000 years ago. 

This marsupial had chisel-like incisors, which inspired its name “diprotodon,” meaning “two forward teeth.”

16. Phorusrhacos (Terror Birds)

Life Restoration of Phorusrhacos
Life Restoration of Phorusrhacos | Charles R. Knight via Wikipedia Public Domain
Name Meaning“Aves, Cariamiformes, Phorusrhacidae”
EraCenozoic – Tertiary
ClassificationAves, Cariamiformes, Phorusrhacidae
Height2.4–2.7 meters (7 feet 10 inches to 8 feet 10 inches)
Weight150–250 kg (330–550 pounds)
LocationSouth America

Terror birds is the common name for a large group of prehistoric birds that were the apex predators in the Americas during the Cretaceous Period. 

After the dinosaurs went extinct 66 million years ago, these carnivorous flightless birds in the Phorusrhacid family took over as the apex predators of the terrestrial landscape. 

They stood tall, with powerful beaks and strong talons that made them very efficient hunters. 

The large beaks of these birds were strong enough to crush bones, allowing them to feed on a variety of prey, including small mammals and reptiles.

Phorusrhacos was one of the most popular terror birds. 

But there were several others, such as Titanis, Patagornis, and  Devincenzia

15. Sarcosuchus 

Gage Beasley Prehistoric's Sarcosuchus Concept
Gage Beasley Prehistoric’s Sarcosuchus Concept
Name Meaning“Flesh crocodile”
EraMesozoic – Early Cretaceous
ClassificationReptilia, Pseudosuchia, Crocodylomorpha
LengthUp to 12.9 meters (40 feet)
WeightOver 10 tons

Also commonly referred to as the SuperCroc, Sarcosuchus was the largest crocodile to have ever lived. 

While the largest crocs today rarely top 25 feet, the Sarcosuchus was up to 40 feet long from head to toe and weighed more than 10 tons. 

It lived in North Africa during the Late Cretaceous, in the same region as the Spinosaurus, one of the largest carnivorous dinosaurs that have ever lived. 

Despite its massive size, the Sarcosuchus was likely a piscivore which means it ate fish as a major part of its diet. 

However, it was capable of hunting other prey too.

14. Dimetrodon

Gage Beasley Prehistoric's Dimetrodon Concept
Gage Beasley Prehistoric’s Dimetrodon Concept
Name Meaning“Two Measures of Teeth”
EraPaleozoic – Permian 
ClassificationSynapsida, Pelycosauria, Sphenacodontidae
Length3 to 4.5 meters (10 to 15 feet)
Weight28–250 kg (62–551 lb)
LocationNorth America and Europe

Often mistaken for a dinosaur, Dimetrodon evolved and went extinct several million years before the first dinosaurs evolved. 

It lived during the Permian Period, about 295 to 272 million years ago.

The major reason this non-mammalian synapsid is often mistaken for a dinosaur is because of the giant sail-like structure on its back, which is similar to the sail of some dinosaurs. 

The sail likely served the purpose of thermoregulation or display. 

Dimetrodon was a carnivorous synapsid that inhabited the swamps and wetlands of Permian North America and Europe.

It preyed on fish and other small animals in its ecosystem. 

13. Elasmotherium

Gage Beasley Prehistoric's Elasmotherium Concept
Gage Beasley Prehistoric’s Elasmotherium Concept
Name Meaning“Laminated beast”
EraCenozoic – Quaternary 
ClassificationMammalia, Perissodactyla, Rhinocerotidae
Height2 meters (6.5 feet)
Length5 meters (16 feet)
Weight3.5–5 tons (7,000–10,000 pounds)
LocationEurope and Asia

Elasmotherium was a prehistoric rhinoceros that lived during the Pleistocene Epoch, around 2.5 million to 10,000 years ago. 

This large rhinoceros is considered the largest rhinoceros to have ever lived. 

It lived in grasslands and savannahs across Eurasia and was alive until about 39,000 years ago. 

Elasmotherium was as big as a mammoth and is often depicted as a woolly mammal with layers of hair covering its body to protect it from the harsh cold weather of the Pleistocene epoch. 

It has been nicknamed the Siberian unicorn due to its prominent single-snout horn. 

12. Hyaenodon

Life reconstruction of H. horridus
Life reconstruction of H. horridus | Nobu Tamura via Wikipedia CC BY-SA 4.0
Name Meaning“Hyena tooth”
EraCenozoic – Tertiary
ClassificationMammalia, Creodonta, Hyaenodontidae
Height1.4 meters (4.6 feet)
Length6 meters (20 feet)
Weight500 kilograms (1,100 pounds)
LocationNorth America, Europe, Asia, and Africa

Despite the similarities in their name and overall physical attributes to hyenas, the Hyaenodon is not a relative of present-day Hyenas. 

Instead, it was a creodont, a member of a group of carnivorous mammals that became one of the top predators of the Cenozoic Era shortly after the dinosaurs went extinct. 

The Hyaenodon was a prolific predator that hunted primitive horses, rhinos, and other large animals in Europe, Asia, and North America. 

Hyaenodon was a formidable predator with oversized muscular jaws strong enough to snap the neck of large prey with a single bite. 

11. Arthropleura

Gage Beasley Prehistoric's Arthropleura Concept
Gage Beasley Prehistoric’s Arthropleura Concept
Name Meaning“Jointed rib”
EraPaleozoic – Carboniferous 
ClassificationDiplopoda, Arthropoda, Arthropleuridae
Length1.5–2.5 meters (5–8 feet)2.6 meters (8.5 feet)
Weight50 kilograms (110 pounds)
LocationNorth America, Europe

Long before the dinosaurs evolved, large critters like the Arthropleura dominated the terrestrial landscape. 

This giant millipede dominated the Carboniferous forests of North America and Europe about 330 million years ago. 

It could grow over eight feet in length and was one of the largest animals on land during the Paleozoic Era. 

Arthropleura is also reputed as the largest terrestrial invertebrate to have ever lived. 

Although scientists are not certain what this massive arthropod ate when it was alive, a herbivorous diet has been proposed.

10. Thylacoleo

Gage Beasley Prehistoric's Thylacoleo Concept
Gage Beasley Prehistoric’s Thylacoleo Concept
Name Meaning“Pouch lion”
EraCenozoic – Quaternary 
ClassificationMarsupialia, Diprotodontia, Thylacoleonidae
Height75 centimeters (30 inches)
Length150 centimeters (59 inches)
Weight90–160 kilograms (198–352 pounds)

Thylacoleo is unique because it was a carnivorous marsupial that evolved from herbivorous ancestors. 

The common name of this predator is the pouch lion. 

However, it wasn’t related to lions or any of the big cats. 

Instead, it was a marsupial related to wombats and koalas more than any other living species. 

Thylacoleo was the top mammalian predator in Australia during the Pleistocene Epoch. 

Thylacoleo had one of the strongest bite forces of any mammalian predator, comparable to that of the African lion. 

9. Entelodon

Restoration of E. Magnus | Concavenator via Wikipedia CC BY-SA 4.0
Name Meaning“Perfect tooth
EraCenozoic – Tertiary
ClassificationMammalia, Artiodactyla, Entelodontidae
Height1.35 meters (4 feet 5 inches)
Length2.5 meters (8.2 feet)
Weight900 kilograms ( 2,000 pounds)
LocationEurope, North America, and Asia

Enteldon was a pig-like mammal related to modern-day hippos and whales. 

It lived during the Oligocene and Miocene epochs, about 33.9 to 16 million years ago. 

Enteldon was an omnivore. 

It had a long snout with specialized teeth for cutting and grinding food.

Fossils of this hippo-relative have been found across various continents, including Europe, Asia, and North America.

8. Anomalocaris

Gage Beasley Prehistoric's Anomalocaris Concept
Gage Beasley Prehistoric’s Anomalocaris Concept
Name Meaning“Unusual shrimp”
EraPaleozoic – Cambrian 
ClassificationDinocaridida, Radiodonta, Anomalocarididae
Length1 meter (3.3 feet)

Anomalocaris is one of the earliest apex predators known from Earth’s prehistoric past. 

It was one of the largest animals in the aquatic ecosystem of the Cambrian Period. 

The shrimp-like invertebrate had large, segmented appendages that were probably adapted for catching prey. 

It also had large compound eyes and swimming flaps on the side of its body for active locomotion in the water. 

Anomalocaris likely preyed on smaller marine organisms, including trilobites and other marine arthropods. 

6. Mosasaurus

3D rendering of Mosasaurus
3D rendering of Mosasaurus / Vac1 via Istock
Name Meaning“Meuse lizard”
EraMesozoic – Late Cretaceous
ClassificationSquamata, Mosasauria & Mosasauroidea
HeightCarnivorous, primarily piscivorous
Length12–18 meters (39–59 feet)
Weight10 to 20 metric tons (22,046.23 to 44,092.45 lbs)
LocationNorth America, Europe, Africa

During the Late Cretaceous, a group of squamate reptiles (relatives of snakes and lizards) known as mosasaurs dominated the aquatic ecosystem. 

The Mosasaurus is one of the most well-known members of this group. 

It was a large aquatic reptile with a skull similar to that of crocodilians and a streamlined body similar to that of whales. 

Mosasaurus was fully adapted to aquatic life. 

All its limbs were replaced by flippers, and it swam using its tail. 

Mosasaurus lived in oceans worldwide, preying on fish and other marine creatures.

6. Titanoboa

Gage Beasley Prehistoric's Titanoboa Concept
Gage Beasley Prehistoric’s Titanoboa Concept
Name Meaning“Giant boa”
EraCenozoic – Paleogene Period 
ClassificationReptilia, Squamata, Boidae
Length11– 15 meters (39–49 feet)
Weight1,135–1,135 kilograms (2,500–2,500 pounds)
LocationSouth America

Titanoboa was a massive prehistoric snake, possibly reaching lengths of up to 40 feet, and weighed as much as 2,500 pounds.  

It was the largest prehistoric snake ever discovered. 

Titanoboa inhabited rainforests in what is now South America during the Paleocene epoch from 66 million to 56 million years ago. 

Boids like the Titanoboa became the dominant terrestrial predators after the dinosaurs went extinct. 

They preyed on large mammals and other reptiles, with a hunting style similar to that of the anaconda. 

5. Platybelodon

Gage Beasley Prehistoric's Platybelodon Concept
Gage Beasley Prehistoric’s Platybelodon Concept
Name Meaning“Flat-spear tooth”
EraCenozoic – Neogene
ClassificationMammalia, Proboscidea, Amebelodontidae
Height3 meters (10 feet)
Length5–6 meters (16–20 feet)
Weight2–3 tons
LocationEurope, Asia, and Africa

The Platybelodon is famous as the prehistoric elephant that had shovels for a mouth. 

This is due to the flat lower tusks that stuck prominently out of the elephant’s jaws. 

Platybelodon lived in the swampy grasslands and savannas of Africa and Asia during the Pliocene Epoch. 

Initially, experts thought the shovel-like tusks were useful for scoping aquatic vegetation into the elephant’s mouth. 

However, recent studies suggest it probably functioned like a scythe for cutting vegetation. 

4. Meganeura

Magneura | André Nel et. al via Wikipedia CC BY 4.0
Name Meaning“Large-nerved”
EraPaleozoic – Carboniferous 
ClassificationInsecta, Meganisoptera, Meganeuridae
Wingspan70 centimeters (28 inches)
LocationEurope and North America

Meganeura was a giant dragonfly that lived during the Carboniferous Period, about 300 million years ago. 

It was alive until the Late Permian Period. 

The Meganeura had a wingspan of about 2.5 feet, making it one of the largest flying insects to have ever lived. 

Considering how long ago it lived, it was also one of the first animals to evolve the ability to fly, long before the pterosaurs and birds came on the scene. 

It likely inhabited swampy environments of the Carboniferous and was an active insectivore. 

3. Plesiosaurus 

Gage Beasley Prehistoric's Plesiosaurus Concept
Gage Beasley Prehistoric’s Plesiosaurus Concept
Name Meaning“Near to lizard”
EraMesozoic – Jurassic 
Height1–2 meters (3-6 feet)
Length2.87–3.5 meters (9.4–11.5 feet)
Weight185 kilograms (408 pounds)
LocationEurope and North America

The Plesiosaurus was a large marine reptile that lived during the Jurassic Period. 

It is the most popular member of the Plesiosauria group, which includes several other related marine reptiles that were widespread during the Jurassic. 

Plesiosaurus had a thick turtle-like torso, a long neck, and a small head. 

This is a sharp contrast to the closely related pliosaurs known for their shorter neck and thicker torso.  

Plesiosaurus had stiff flippers effective for paddling through the water but practically useless on land. 

2. Liopleurodon

Liopleurodon 3D Render
Liopleurodon 3D Render / CoreyFord via Istock
Name MeaningSmooth-sided tooth
EraMesozoic – Early Jurassic
ClassificationReptilia, Plesiosauria, Pliosauridae
Length6.6 meters (22 feet)
Weight3.3 tons (7275 pounds)
LocationEurope (England and France)

Liopleurodon was a pliosaur, a relative of the long-necked plesiosaurs, but with a distinctively different appearance. 

Liopleurodon was one of the largest pliosaurs ever discovered. 

It was a top predator of the Middle to Late Jurassic seas of Europe. 

The massive marine reptile thrived on a diet of fish, cephalopods, and smaller marine reptiles. 

The largest species in the genus was up to 6.6 meters (22 feet) long and weighed up to 1.7 tons on average. 

1. Basilosaurus 

Gage Beasley Prehistoric's Basilosaurus Concept
Gage Beasley Prehistoric’s Basilosaurus Concept
Name Meaning“The King Lizard”
EraCenozoic – Paleogene
ClassificationArtiodactyla, Cetacea, Basilosauridae
DietCarnivorous (Piscivorous)
Length15–20 meters (49–66 feet)
Weight5.8 tons (11600)
LocationNorth America, Africa, and Asia

The Basilosaurus was a massive, sharp-toothed marine creature. 

Perhaps this was why scientists that described it first thought it had to be a reptile. 

Basilosaurus means “king lizard,” which would have been an apt name for this gigantic sea monster. 

Except the Basilosaurus was not a reptile at all. 

Instead, it was a prehistoric whale that evolved from land-dwelling hoofed mammals.

With a maximum length of up to 66 feet, this cetacean was one of the largest animals known to have existed after the dinosaurs died off at the end of the Cretaceous. 

It fed on fish, large sharks, and marine reptiles in the shallow Tethys Sea where it lived. 


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