Biological thermal bomb Bashny.Net

Japanese beekeepers prefer to breed European bees that are more honey than the endemic Japanese bees. However, the hives are often attacked by the Japanese subspecies of the Asian hornet huge, one individual who can kill forty bees per minute. Local bees, unlike European, learned to confront these hornets. Several hundred bees gather around the predator in one big ball and work the muscles, warming the air inside the balloon to 47 ° C. Hornet, withstand a maximum temperature of 46 ° C, die from overheating.
Source: ru.wikipedia.org