The 2-inch (5cm) long Asian giant hornets, Vespa mandarinia, have been found in Washington state. Multiple stings are deadly to humans and in their "Slaughter phase" the hornets destroy honeybees, whose bodies they feed to their young. Source 4t
Image from Wikimedia public domain.
Not only do they sound terrifying, they look terrifying as well! These insects would be a good base for a villain in a movie. They are also beautiful, with their golden yellow and black coloring.