Spinosaurus

• This dinosaur got its name from the large spine on its back, says the Enchanted Learning website. If the name is translated in English, it literally means "spiny lizard." It lived in what is now North Africa, which was at the time a swamp, and that is why scientists believe the dinosaur had the big spine on its back. Spinosaurus was about 40 to 50 feet long and could weigh over 4 tons. It was a meat-eater, feeding mostly on smaller plant-eating dinosaurs and fish.
  
  

Velociraptor

• Velociraptor was one of the most intelligent dinosaurs, and a very dangerous predator. These dinosaurs hunted in packs, and scientists believe they attacked dinosaurs that were bigger than them. Velociraptors weren't very big themselves, only about 3 feet tall and 5 to 6 feet long, and weighed from 15 to 33 pounds. However, they were extremely fast and agile. They were two-legged dinosaurs with three sharp claws on their hands and four on their feet. Some of their teeth were over an inch long.
  
  

Ceratosaurus

• This is another highly intelligent dinosaur. Ceratosaurus were meat-eaters and scavengers. They hunted in packs and were able to kill the biggest among dinosaurs. They walked on two legs and had a horn on the nose. They were 15 to 20 feet in length and weighed between 1/2 to 1 ton. Scientists believe Ceratosaurus had exceptional eyesight due to their large eyes.
  
  

Pteranodons

• Pteranodons were the flying dinosaurs. According to the Oceans of Kansas website, they had hollow bones filled with air, which equipped them perfectly for flying. These animals were about 6 feet long and weighed about 35 pounds. When the Pteranodons spread its wings, it measured between 25 and 33 feet, says the Enchanted Learning website. These animals had no teeth, but were nevertheless meat-eaters, feeding off fish, insects and mollusks. They were also scavengers.