Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon The Camarasaurus sauropod dinosaur known

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

A definitive explanation for their mass extinction is yet to be agreed upon

with full adulthood being reached at 36 months

Dragonflies spend the larval portion of their lives in freshwater

Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon The Camarasaurus sauropod dinosaur knownParasaurolophus 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