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Meet Our Dinosaurs

TYRANNOSAURUS
aka T-Rex

One of the largest-ever flesh-eating land animals, Tyrannosaurus is also the most famous.  Tyrannosaurus had a huge skull with powerful jaws lined with 7-inch serrated teeth. Contrary to earlier conceptions of sluggish mobility, Tyrannosaurus is now thought by some to have been capable of bursts of up to 30 mph. In contrast to its massive legs, Tyrannosaurus had relatively short, small arms. Although they seem vestigal and useless, they were powerful enough to lift over 450 pounds. 

TRICERATOPS
Found in Montana, South Dakota, Colorado, Wyoming, and Canada, Triceratops was the largest, heaviest, most common and best-known ceratopsian.

STEGOSAURUS
Stegosaurus is the only plated dinosaur ever found in western North America. The large triangular plates that ran along its back were probably arranged in a double row, and its tail was armed with four long spikes. 

ANKYLOSAURUS
The best known of the armored dinosaurs, Ankylosaurus was the last and largest of the ankylosaurids. Its tough skin was covered with bony plates, and it could swing its formidably clubbed tail to render a predator lame. 

PACHYCEPHALOSAURUS
Wart-like knobs and five-inch spikes fringed the ten-inch thick dome of Pachycephalosaurus, a rare dinosaur first discovered in Montana.

IGUANODON
Iguanodon is one first dinosaurs to be named and described, the other two being Megalosaurus and Hylaeosaurus. It received its name from the fact that it had teeth resembling those of modern Iguana lizards, although much larger.

PROTOCERATOPS
Discovered in China and Mongolia, this forerunner of the horned dinosaurs was the first dinosaur known through every stage of life. Potato-shaped eggs, found in the 1920's by Roy Chapman Andrews, were attributed to Protoceratops because of the great abundance of Protoceratops bones throughout the same formation.

ORNITHOMIMUS
Ornithomimus has been discovered in many sites in the western United States and Canada. Ornithomimids closely resembled the modern ostrich. Although its head was small, Ornithomimus possessed a large braincase and is considered to be one of the most intelligent of the dinosaurs.

APATOSAURUS
Apatosaurus is one of the best known of all dinosaurs but usually by its more popular name "Brontosaurus". Its 20-foot-long neck supported a rather small head and its brain was about the size of a large apple. 

BARYONYX
Discovered in southern England, Baronyx had a huge curved claw over 12 inches in length on each hand. 

DEINONYCHUS
The discovery of this dinosaur in Montana in 1964 drastically altered the traditional view of dinosaurs as sluggish, slow-moving reptiles. Deinonychus was obviously built for speedy pursuit of its prey. Among other things, it had special interlocking vertebrae that allowed its tail to stiffen for balance while running. Excellent eyesight, sharp, serrated teeth that curve backwards for slicing, and the namesake 5-inch (13 cm) long, knife-like claws on each foot make Deinonychus a fearsome hunter.

DILOPHOSAURUS
Dilophosaurus takes its name from the delicate double crest on its head. This odd-appearing crest may have served as a secondary sexual characteristic, differentiating males from females. 

DIPLODOCUS
Discovered in the western United States, the Diplodocus skeletons are among the longest dinosaur skeletons ever found. Diplodocus' neck contained 15 bones and the tail had anywhere from 70 to 90 although a complete tail has never been found.

SALTASAURUS
The first sauropod known to be armored, Saltasaurus was found in Argentina. Its broad back and sides were guarded by small bony studs and several bony plates

VELOCIRAPTOR
Found in Mongolia, China and Russia, Velociraptor was a ferocious predator with the second toe of each foot bearing a formidably large, retractable claw. Velociraptor was similar in appearance to the larger Deinonychus and the much larger Utahraptor. Like Deinonychus and possibly Utahraptor, it may have hunted in packs -- although Velociraptor and Utahraptor fossils have never been found in groups like Deinonychus. Velociraptor was not as fast as a cheetah, nor as smart as a chimpanzee, as suggested in the movie Jurassic Park.

MAIASAURA
It was the discovery of a hadrosaur crèche in Montana that provided evidence of nurturing behavior in dinosaurs. Remains of Maiasaura nestlings revealed worn teeth, which suggests that they were fed by their parents until they were able to leave the nest.

SPINOSAURUS
Found in Egypt, Spinosaurus may have been the largest of theropods, larger even than Tyrannosaurus. This evaluation is based on the fact that the vertebrae of Spinosaurus were 20% larger than those of Tyrannosaurus.

DEINONYCHUS
The discovery of this dinosaur in Montana in 1964 drastically altered the traditional view of dinosaurs as sluggish, slow-moving reptiles. Deinonychus was obviously built for speedy pursuit of its prey. 

CORYTHOSAURUS
Corythosaurus had a hollow, helmet-shaped crest atop its long, narrow head. Though its beak-shaped snout had no teeth, its cheeks were lined with batteries of plant-grinding teeth. This dinosaur was discovered in Alberta, Canada.

CERATOSAURUS
Ceratosaurus was found in western North America. It has horns above and forward of its eyes, resembling those of Allosaurus, but it Ceratosaurus derives its name from its extremely unusual, rather large nose horn. Because Ceratosaurus was a very large predator, it is not likely that the horn was a weapon.

Pterosaur
Pterosaurs lived during the Mesozoic Era, the Age of Reptiles. The primitive types of pterosaurs appeared during the Triassic, and died out at the end of the Jurassic period. More advanced pterosaurs appeared late in the Jurassic period and died out during the Cretaceous, about 65 million years ago, during the K-T extinction.