Shastasaurus:Shastasaurus lived during the Triassic period, about 235-200 million years ago. They could grow up to 75 feet long and weighed up to 33 tons.
Quetzalcoatlus:Quetzalcoatlus lived in the Late Cretaceous period, around 70-66 million years ago. They grew up to 10 feet tall and had a wingspan of up to 36 feet.
Plesiosaurus:The plesiosaurus lived from 228 million years ago to 61.6 million years ago, which placed it in the Jurassic period.
Nothosaurus:Spending time on land was a helpful survival mechanism for this 23-foot-long reptile. By venturing out of the water, it could escape marine predators.
Mosasaurus:The real-life mosasaurus lived not in the Jurassic, but the Late Cretaceous period, which was 70-66 million years ago.
Liopleurodon:Liopleurodon lived in the Jurassic period, about 160-155 million years ago. It grew up to 33 feet long and weighed up to three tons, about the same as a modern rhinocerous.
Ichthyosaurus:Ichthyosaurus was a dolphin-like reptile with four flippers and a long, narrow, tooth-filled snout. It lived in the Early Jurassic period, 200-190 million years ago.
Elasmosaurus:These ancient marine reptiles lived in the Late Cretaceous period, about 80-70 million years ago. They grew up to 49 feet long and weighed up to four tons.
Dakosaurus:Dakosaurus was a scary alligator-like reptile that lived in the shallow seas of the Late Jurassic period, about 150-145 million years ago. It grew up to 16 feet long and could weigh 1,300 pounds.
Arambourgiania:Arambourgiania also lived in the Late Cretaceous period, around 70-66 million years ago. It was one of the largest flying animals that has ever lived on Earth.