Exionasaurus

A meat-eating dinosaur that lived during the Jurassic Era. It was thought to have lived on the Arcadia peninsula of Pangea. Personality traits may have included cunning, veracious feeding tendencies, and uncanny listening skills. Also, according to the fossil records, they may have hunted in packs of threes. Sometimes they would run, climb, or sneak to happenstance upon their prey. Fossil evidence confirms that their prey consisted of primates and other slow-moving mammals.

Scientists think it is possible that because they were so successful, they may have died out after over-hunting their own sources of food; thereby unknowingly dooming themselves in the process.