Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon but not the scales of

but not the scales of the cone

A complete tooth with root could be over 12 inches long

There are vertical and horizontal hangers on the back

with full adulthood being reached at 36 months

The Camarasaurus sauropod dinosaur known as Lyle is the largest discovered to date

Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon but not the scales ofParasaurolophus was a long crested, duck billed (hadrosaur) dinosaur. Its extremely long, backwards leaning, hollow, bony crest was as bigger than the rest of its skull and may have been used to produce a low frequency, foghorn like sound, enhance its sense of smell, and or used in courtship displays. The Parasaurolophus' nostrils (at the end of its snout) went up through the crest and back down it, forming four tubes. The crest was up to 6 feet (1. 8