Madtsoia
Pliosaur
One of the largest species of snakes that ever lived on earth, the Madtsoia snake reached up to 20 meters in length. It often fed on dinosaurs and used its muscular body to squeeze it’s pray to instant death. It also survived the age of dinosaur extinction, but thankfully perished about 45 million years ago (Listverse).
Also one of the most dominant creatures that ever inhabited the ocean, Pliosaurs were marine reptiles that had enormous jaws with spiked teeth. Their length could range from 4 to 15 meters (DesignSwan), however, the largest Pliosaur skeleton ever found was 52 feet long, with a head of 8 feet on its own (Marc).