Hornets!
"The largest hornet in the world, the aggressive black-and-yellow giant hornet is both feared and revered in Japan. A small but highly efficient killing machine—a hornet two inches long and with a wingspan up to three inches—lurks in the mountains of Japan. The voracious predator has a quarter-inch stinger that pumps out a dose of venom with an enzyme so strong it can dissolve human tissue.” (src)
Based on a comment by Ken, I thought I should elaborate on this subject. There are not that many deadly creatures in Japan, but this one is just sooo cool.
Please view the following video… Japanese Giant Hornets - Windows Media