Medroanosaurus

Medroanosaurus is an extinct non-avian theropod dinosaur part of the Dilophosauridae family that lived in what is now North America during the Early to Late Jurassic period (from around 195 mya to around 150 mya), making it one of (if not) the last species of Dilophosaurid in Earth's history (before time travel became reality). Unlike its more well known relatives such as Dilophosaurus, Medroanosaurus did have a leathery cartilaginous frill (similar to that of a fictional Jurassic Park Dilophosaurus), as one fossil impression confirms. One adult specimen was only about the size of a Deinonychus, but another larger adult specimen, which was a different species, was about the size of a much larger-sized Dilophosaurus. It had a more Dromaeosaur-shaped skull and teeth, unlike Dilophosaurus (which had a bizarre hooked jaw), giving Medroanosaurus an ability to hunt (possibly) larger prey. It is unknown why Medroanosaurus became extinct.