Mosasaur
The deadliest lizard from
the Meuse River


Physical features:
Small head at the the end of a long neck with sleek body and 2 pairs of wide flippers.

Size & weight:
About 15 feet long and 1,000 pounds.

Megalodon
the biggest prehistoric shark
 


Physical features:
Shark-like. The closest living relative is the Great White Shark.

Size & weight:
Up to 60 feet long. Much bigger than the biggest marine reptiles.

Interesting fact:
Had the most powerful bite of any creature ever lived. It could clamp its jaw shut with about 10-18 tons of force per square inch - enough to crush the skull of a prehistoric whale as easily as a grape.

Protostega
soft shell sea turtle
 


Physical features:
Turtle-like outlook. But with a soft shell make of a thick web of bones which provide less protection, and flipper-like front legs.

Size & weight:
Up to around 10 feet long.

Interesting fact:
Strong and inexhaustible swimmer. Second largest sea turtle that ever lived, just behind Archelon. Females likely migrate hundreds of miles to lay eggs on sandy beaches like their descendants.

Raptor
the bird-like dinosaur 
 


Physical features:
Three-fingered hands with huge and long claws on their hind feet. Feather-covered.

Size & weight:
Varies enormously.

Interesting fact:
Most likely hunt at night, as evidenced by their larger-than-usual eyes which allow them to gather in more available light and hunt for smaller preys in near-dark conditions.