Brachiosaurus was an unusual dinosaur that lived 155.7 million to 150.8 million years ago during the mid- to late Jurassic Period. Specimens have been found primarily in the fossil-rich Morrison Formation in North America, but the dinosaur did not resemble any of the others that roamed the region. Its long neck made it look like a giraffe, and its forelegs were longer than its hind legs. The name Brachiosaurus, in fact, means "arm lizard."
Triceratops, with its three horns and bony frill around the back of its head, is one of the most recognizable dinosaurs. Its name is a combination of the Greek syllables tri-, meaning "three," kéras, meaning "horn," and ops, meaning "face." The dinosaur roamed North America about 67 million to 65 million years ago, during the end of the Cretaceous Period.
Stegosaurus had large bony plates and a small walnut-sized brain. It is a media star, often appearing in movies, television and cartoons. This Dinosaur lived during the jurassic period about 150.8 million to 155.7 million years ago, primarily in western North America. It was about the size of a bus and carried around two rows of bony plates along its back that made it appear even bigger. Scientists aren't really sure if the pates were fro fighting or scaring off predators, because these plates could have been used keep the dinosaur coolly reflecting slight off of the body.
The t-rex is a prehistoric dinosaur. Which means that it lived prior to historic history. T-rexes are carnivores, so they eat only meat. They use their 60 strong teeth to rip apart and chew their meat. The size of the T-rex is 40 ft long, its tail can be 15 to 20 ft tall. They can grow as mush was 3,950 pounds a year. The Tyrannosaurus Rex lived in the Cretaceous Period in the western United States including Montana and Wyoming.