Honeybee hordes use two weapons - heat and carbon dioxide - to kill their natural enemies, giant hornets. Japanese honeybees form “bee balls” - mobbing and smothering the predators. This has previously been referred to as “heat-balling”, but a study has now shown that carbon dioxide also plays a role in its lethal effectiveness. In the journal Naturwissenschaften, the scientists describe how hornets are killed within 10 minutes when they are trapped inside a ball of bees…. (continues @ BBC News)
