Ceratosaurus

Ceratosaurus was a medium sized predatory dinosaur from the Jurassic period, living about 145 million years ago in North America. Not only is it incredibly rare for the time period compared to other theropods it lived with, such as Allosaurus, it was also very bizarre. This 25 foot predator had a large horn over its nose, two smaller ones in front of its eyes, spiky osteoderms along its spine, and very exaggerated teeth.