Tyrannosaurus rex measures 12.3 meters (40 feet) long, stands 3.66 meters (12 feet) tall at hips, and weighed about 8.4 tonnes (9.3 tons), meaning this dinosaur was bigger than the average African bush elephant and could run as fast as a human. It was the largest carnivore ever in North America.
Gallimimus was a fast, ostrich-like dinosaur with a long, extended tail for balancing while running, and was rather intelligent by dinosaur standards. It had a long neck and large, round eyes, possibly for night vision.
Stegosaurus is a dinosaur that lived around 155 million years ago in the Western portion of North America and parts of Europe.
Because this dinosaur had armored plates that seemed shingled, it was given the name Stegosaurus, which means “roofed lizard”. An interesting fact to note is that of all of the dinosaurs, Stegosaurus had one of the smallest brains, about the size of a walnut.
Pterodactylus was a small reptile, hardly larger than a modern pigeon or crow. It had a very small tail and was quite adept at moving on land as well, because of its smaller size however, it was still vulnerable to dinosaurs and other terrestrial inhabitants.
Troodon Formosus was among the first dinosaurs found in North America, although it was thought to be a lizard until 1877. The name is Greek for “wounding tooth”, referring to the teeth, which were different from those of most other theropods known at the time of their discovery.
Brachiosaurus was a massive dinosaur that weighed as much as 4 elephants, stood almost 3 stories high and was as long as 2 railroad cars.
Brachiosaurus is known for its long neck and its short hind legs. The front legs of this dinosaur are so much larger than the hind legs, that it was named Brachiosaurus—a name which means “arm lizard”.
Velociraptor (Speedy Thief) was a small carnivorous dinosaur, well-known thanks to Jurassic Park. It lived in Mongolia and China 75 to 71 million years ago.
The jaws were lined with serrated teeth for tearing flesh, it swallowed its food in gulps instead of chewing. The arms were long and it had strong chest and arm muscles, for grasping onto prey.
Ankylosaurus was one of the most protected dinosaurs of its time. To protect itself, its back was covered in bony plates that were impenetrable, even its eyelids had bones in them. And if that wasn’t enough, it had a giant club at the end of its tail which was used like a medieval mace. By swinging the club, it had enough force to break the leg bones and immobilize most carnivores like a Tyrannosaurus rex.
Diplodocus is not only one of the most recognizable dinosaurs on the planet but is also considered to be one of the longest. An adult Diplodocus could be over 53 meters (175 feet) long.
It is believed that this dinosaur could whip its tail in much the same way as the Brontosaurus did; Cracking the tail like a bullwhip. Computer models have since shown that the speeds of this tail flicking could have reached the supersonic level, producing a sound much like a cracking bullwhip. However, since the tail of these dinosaurs weighed in excess of 3500 pounds, the sound of this motion would be more like cannon fire and less like a whip crack.
Mesosaurus’ teeth were very thin and were used to filter plankton and not to bite into fish or small animals. Although it is a gigantic creature, it was actually quite a bit smaller than most of the prehistoric crocodiles that would come later.