Zitat aus Rangel et al. 2010:
Rangel/Seeley (2008) discovered that starting about 1 h before departure, a few dozen bees start producing the worker-piping signal, which involves a bee pressing her thorax against other bees while producing a high-frequency (200–250 Hz) vibration of her flight muscles. … The worker-piping signal primes the swarm bees for flight. Then, starting about 5 to 10 min before the swarm’s departure, a few bees start producing the buzz-run signal, which involves a bee butting into other bees while buzzing her wings.