How to kill ten bats with one length of hosepipe.
What happens if you swing a snooker ball in a sock at dusk?
No bats were harmed in the posting of this message.
Apparently if you swing it really fast that can confuse their sonar and they can hit the hosepipe. But that never happened when we did it as kids.
Their sonar operates above 11kHz apparently, unless you've connected it to a helicopter engine I don't think you'll be confusing the little blighters.
@andyp started
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How to kill ten bats with one length of hosepipe.
What happens if you swing a snooker ball in a sock at dusk?