Known as an ichthyosaur, the animal lived about 205 million years ago and was up to 85 feet longalmost as big as a blue whale, say . The 9 Most Dangerous Dinosaurs in Jurassic World Dominion Neither of these predators, however, were ever as big as the modern blue whale, which can reach up to 110 feet (34 meters) long and is the biggest known animal to have ever existed. While only distantly related to T. rex, it too had puny forelimbs. The Most Dangerous Dinosaurs in the Jurassic Park Franchise - MovieWeb But it would have been much faster and more dexterous than its lumbering relative. What did Mosasaurs eat, and how did they catch it? Velociraptor was much smaller than portrayed in Jurassic Park, closer to the size of a turkey; its larger cousin Deinonychus was closer to Hollywood Velociraptor proportions. Primarily found in China and Mongolia, the Velociraptor showed traits of a predator and scavenger. This dinosaur reached up to 4 feet high and 21 feet long and weighed about a hundred pounds. When the creature's remaining bones and teeth are trapped by layer upon layer of mud, sand, or silt, the weight and pressure compress the sediment over thousands or even millions of years, creating sedimentary rock. It roamed the planet 115 million years ago and was always ready to pull out its secret weapon, the terrible claw. The dangerous dinosaur had a unique sickle-shaped claw on the second toe that could cause massive amounts of damage to its prey or rivals. The Megaraptor was another of the most dangerous dinosaurs of all time. Among the numerous water dinosaurs there is, let's focus on the most dangerous ones. However, the reality behind this long-necked, gentle, and herbivore predator ofthe late Jurassic period is very interesting and scary. They were massive creatures that could grow up to sixty feet long! Spinosaurus was a huge dinosaur, about 50 feet long, that lived in and around water. The Most Dangerous Dinosaur | DINO TOYS But it generally is thought to have been quite gentle, landing it further down in the list. Jurassic Park, a movie directed by Steven Spielberg, is one of the greatest "dinosaur films ever," as well as one of many "greatest" films. Quick Answer: What Was The Biggest Dinosaur In Water? They could also swim powerfully and had sharp teeth that they used to hunt their prey. Some species, such as Xenodens calminechari, were only about the size of a porpoise, Live Science previously reported. Leedsicthys had powerful jaws that it could use to attack its prey.