Hornets, like many social wasps, can mobilize the entire nest to sting in defense, which is highly dangerous to humans. The hornet alarm pheromone is used to raise alarm of nest attack and to identify prey, such as bees. It is not advisable to kill a hornet anywhere near a nest, as the distress signal can trigger the entire nest to attack. Materials that come in contact with pheromone, such as clothes, skin, dead prey, must be removed from the vicinity of the hornets nest. Perfumes and other volatile chemicals can be falsely identified as pheromone by the hornets and trigger an attack.