Lumbergosaurus

Lumbergosaurus was a species of Hadrosaur that lived in what is now Montana. It was unique for having a tall unicorn horn-like crest, which could probably inflate like a balloon for communication purpose. Because of this, Lumbergosaurus resembles an outdated pre-2013 Tsintaosaurus. Like most Hadrosaurs (with the exception of Carnovorosaurus), Lumbergosaurus was a herbivore that fed on leaves, cycads, ferns, and horsetails. It was the second most common dinosaur of North America, second only to Triceratops. It might have became extinct due to the asteroid impact and its effects at the end of the Cretaceous Period.