Dilophosaurus

Dilophosaurus was a medium-sized sauropod that lived in North America during the Early Jurassic (about 193 million years ago). It is famous for its venom-spewing and neck frills in the movie 'Jurassic Park', but this is a complete creation: the real Dilophosaurus shows no evidence of venom-spewing, had no neck frills, and was much larger than its movie size. Its most striking feature is the two semicircular crests on top of its skull, from which it gets its name; these crests were probably used for species recognition or sexual display.