The tail of the apatosaurus has 82 interlocking vertebrae bones. This dinosaur may have weighed as much as 33 tons.
Dryosaurus is a plant-eating dinosaur that is considered the gazelle of its time. At 10 feet in length, it could move rapidly.
The Utahraptor may have been the deadliest dinosaur. It was a swift-running raptor with a huge claw on the middle toe of each foot.
Ankylosaurus had a body covered with bony, oval plates set into thick, leathery skin. Rows of spikes covered the body and tail, acting like armor. Its tail could have been used as a club.
Ceratosaurus had a fearsome appearance with a blade-like horn on its snout. This may have been used in head-butting battles with other males to win leadership of a group.
Elasmosaurus lived in the sea and probably paddled along near the surface of the water. It was about 46 feet long, but more than half of its body length was a snakelike neck that could whip into the water to snap up fish.
Source: Ogden's George S. Eccles Dinosaur Park; "Simon & Schuster Children's Guide to Dinosaurs and Other Prehistoric Animals," by Philip Whitfield.