The ads for ultrasonic bird and rodent (and even insect) control
devices appear everywhere, yet, try as I might, I can't find a
single scientific, controlled study on the effectiveness of these
devices. A number of people have told me that the devices work
for a few weeks or months, until the intended victims grow accustomed
to the sound, and then they are no longer effective.
If anyone out there in Museum-L land has a reference of a study
where ultrasonic devices were show to be effective or ineffective,
please post it. It would be such a nice world if only these devices
would really work!
John Simmons
Collections Manager
Museum of Natural History
University of Kansas