They were once giant animals that dominated for a while in certain periods in Earth's history.

1. Jaekelopterus scorpion

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The giant marine scorpion Jaekelopterus is one of the two largest arthropods ever discovered.

Fossils indicate that the Jaekelopterus marine scorpion is 2.5m long. They are one of the two largest arthropod species ever discovered (the other is the Arthropleura, today's centipede).

2. Giant whale Melvillei Livyatan

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Giant whale Melvillei Livyatan

3. Arthropleura

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Arthropleura is like a multi-legged animal today but its length is up to 200cm.

4. Pulmonoscorpius scorpion

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Pulmonoscorpius scorpion

5. Armored fish Dunkleosteus

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Armored fish Dunkleosteus

Dunkleosteus is the largest fish in prehistoric times. Its head and chest are covered with bone-like plates. Instead of teeth, these fish possess two sharp bones, forming a bird-like structure.

Dunkleosteus is capable of attacking with its armored jaws strong enough to tear apart prey that also has armored leather like me. They are dubbed the " ocean nightmare" for all prehistoric marine animals.

This fish shows that they are up to 10 m long and weigh about 4 tons.

6. Super shark Megalodon

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Megalodon shark

Megalodon super sharks have bodies up to 30 m long and weigh more than 100 tons. They were dubbed the most ferocious assassin in Earth's history with enough bites to crush a car.

According to scientists, Carcharodon Megalodon can be 15.9-20.3 m long and weighs 47-103 tons.

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The size between today's white shark and Megalodon shark.

The giant super shark lives in the prehistoric period of the late Oligocene and Neogene period about 28-1.5 million years ago.

7. Huge Piranha fish

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Giant Piranha fish

This fish lives 8-10 million years ago and is 1 meter long, 3 times larger than modern piranhas today.

8. Giant crocodile

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Giant crocodile

This Purussaurus monster alligator lives in the Miocene , 8 million years from us.

With a total body length of up to 13m, weighing nearly 10 tons, Purussaurus is the largest and most ferocious crocodile in Earth's history.

9. Giant squid

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Giant squid is 9 meters long and they lived about 470 million years ago.

10. The Titanoboa Python

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Titanoboa Python

Titanoboa (giant python) is a snake genus that lived about 60 to 58 million years ago, in Paleocene.

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The researchers estimated that T. cerrejonensis is about 13m long, weighs about 1,135 kg and is about 1 meter wide at its thickest point.