From National Geographic:
A small but highly efficient killing machine lurks in the mountains of Japan—the Japanese giant hornet. The voracious predator pumps out a dose of venom with an enzyme so strong it can dissolve human tissue. Just a handful of these hornets can kill 30,000 European honeybees within hours. Watch an attack of giant hornets on a beehive, and learn the surprising secret that Japanese honeybees use in their defense. (Picture from Wikipedia).
Watch this stunning video here.