Monolophosaurus

The single crested lizard, Monolophosaurus was a medium sized theropod dinosaur about 5 meters long ( or around 16 feet ). It lived during the middle jurassic period of Xinjiang,China.

This carnivore was fast and dangerous,possibly capable of taking down prey as large as itself. It also could have scavenged leftover carrion of dead dinosaurs.

Though they sound similar Monolophosaurus and Dilophosaurus are not related.