Strategy of Japanese honebees

When the natural enemy of Japanese honeybee, hornet enters their colony, upto 500 bees quickly form a 'hot defensive bee ball,' trapping the hornet inside and heating it up to 46 degrees C (115F) with their collective body heat. They generate the heat by vibrating at once.

Researchers say that the neural activity in bees taking part in the attack picks up. The high temperature phase lasts about 20 minutes, it often takes up to an hour before the hornet dies inside the ball. There's an astounding fact that the collective heat generated by the group, while fatal for the hornet, leaves the bees unaffected.