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A bee from another hive gets pushed out because he has a diffent queen's pheremone, but he probably won't be hurt too badly if he doesn't resist.
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I saw a documentary about this once.
A much larger species from a rival colony infiltrated the hive. I forgot how he managed to sneak in, something to do with mucking up the other bees' sensory chemicals. In any case, they found him out and executed him by swarming him and vibrating their bodies. By doing this they increased their body temperatures and basically "cooked" the bee that didn't belong.