I can actually SING to an observation (a very loud "Ah...") and see that all bees stop (except the dancers and DVAVers)... a pretty good trick to show to people, but it is pretty loud... I learned about this when I was a graduate and got bored one day after 4 months of sitting in front of an observation hive for 8 hrs a day... try it yourself.... it even works in a real colony (with a frame out to observe). Zach http://www.bees.net -- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---