I don't see anything in this that indicates or even suggests that the
bees are hearing (sensing compression waves in air) anything.  More
probably the bees are responding to a stationary (in space) object flapping
around, dark, but reflecting UV light, breathing out bee breath,
highlighted by wrinkles in a dark, possibly reflective mist net.  I'm
reminded of the black suede (silent) patches we used to wave in front of
feral swarm-trapped hives to measure defensive behavior by counting the
number of stings.
   I'm not saying that bees can't hear. As PB points out, it's unlikely.
Interesting observations, though!
Cheers,
Kristina Williams
Boulder CO

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