Bats use ultrasound. Beam around 100Khz and listen for the doppler modulated
return their fluttering little wings create.

I thought a kewl yuppy toy would be a little phased array panel that fires
compressed vortex rings to blow the wings off da 'lil suckers. Or perhaps
just a brief squirt of water would do. I have a feeling that between a
couple watts of ultrasound and the firecracker-like pop of the vortex
cannon, it would be too obnoxious to keep around.

Scott

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Freedom is pursuing your carrot, not running from a stick.
The mob only rules what its members are allowed to achieve.
Democrats are the anvil, Republicans the Hammer, and we -
    the Piggy Bank
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