Top 10 Scariest Prehistoric Non-Dinosaurs Monsters

The Top Ten
1 Thalattoarchon
2 Megatherium
3 Phorusrhacidae
4 Megalodon

Get this up at no. 1. This animal could swallow any of the animals above without knowing

Prehistoric sharks!

5 Quetzalcuatlus
6 Gorgonops
7 Mosasaur
8 Sarcosuchus
9 Liopleurodon Liopleurodon is a genus of large, carnivorous marine reptile belonging to the Pliosauroidea, a clade of short-necked plesiosaurs. The two species of Liopleurodon lived during the Callovian stage of the Middle Jurassic Period.
10 Pterodactyl
The Contenders
11 Titanoboa
12 Jaekelopterus Rhenaniae
13 Quetzalcoatlus
14 Arthropleura
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