Would a personal alarm work against a wild animal

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Yasser

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Yasser  asked the Naked Scientists:
   
Dear Naked Scientists,
 
Would a personal alarm, designed to produce a 115 decibel siren to intimidate a human attacker, have the same effect on a wild aggressive animal like a grizzly bear or a cougar?

I understand animals perceive sound in different ways, some hear sound humans cannot, but can a personal alarm save the live of a stray camper who has come face to face with one of the above wild animals?
 
Sincerely,
Yasser in Canada

What do you think?
« Last Edit: 15/05/2010 21:30:03 by _system »