Montanoraptor

Montanoraptor was a species of Dromaeosaur-grouped raptor dinosaur that lived in what is now Montana and South Dakota during the Late Cretaceous period (around 73-66 mya). It probably evolved from some group of Squatmaraptors that had spread into North America from Asia (as some fossil evidence suggests). It was also featherless, much like Squatmaraptors, but even males of this species lacked feathers. They were also confirmed to have prognated hands much like Squatmaraptors to grasp onto objects (so it is possible for this species to open and close doors and other similar objects). They were also among the smartest dinosaurs on Earth, being about as smart as today's apes such as Chimpanzees, so they were much smarter than Troodons, the smartest non-Dromaeosaur-type dinosaurs. They were the much larger, more intelligent, and more aggressive rivals to the smaller and feathered Dromaeosaurus, but it was also a rival to a larger and feathered Dakotaraptor. Montanoraptor might had went extinct due to an asteroid/comet impact in the Gulf of Mexico that changed the environment so much that Montanoraptor couldn't adapt to the changes and were made extinct.