>> I know a popular item where there are a lot of deer are these little
>> black plastic things that you mount on your front bumper or behind the
>> grill so air can blow through them. Supposedly the sound, which I think
>
>I've got two on my B.
Problem with mounting them is that they require air to flow through them.
Mounted on a
bumper, very little air actually flows through. They are instead in a
relatively
static pocket of high pressure air. You'd have to mount them on a pole stuck
up severl
feet to get the air to flow through them, and they require an air velocity or
at least
30-40 mph to operate.
>> is inaudible to humans, is very irritating to deer and will drive them
>
>The sound is ultrasonic. I don't know if the sound is irritating, but I
>know that the higher the pitch, the more directional the sound appears.
>That gives the deer a chance to track your approach.
As deer cannot hear above roughly 15khz, ultrasonic sounds are as silent to
them as
they are to you and I.
>> away. I can't really say if they actually work or not. I've never used
>
>Each time I've encountered deer at the side of the road, they've gone
>back into the bush, NOT run across the road. Same thing with rabbits.
That's the rub. While what I just said above is scientificly and factually
true,
people that have the units have seen good results by and large. Seems that
technically
it cannot work, but seems that they may. But, I also would like to point out
that many
of the deer and other critters I encounter with my car also skedadle away,
without the
use of any deer whistle, functional or not.
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