Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon Mene rhombea had a laterally

Mene rhombea had a laterally compressed body

A complete tooth with root could be over 12 inches long

with full adulthood being reached at 36 months

New Zealand

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

Parasaurolophus walkeri, left lower jaw (juvenile) hadrosaur Pteranodon Mene rhombea had a laterallyParasaurolophus 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