Ultrasonic Bird Deterrents Ineffective In Bird Control

If you suffer from pest bird infestations and you invested in an ultrasonic bird control device

, dont be surprised if the birds keep coming back. You may not be able to hear ultrasonic frequencies (a good thing) but neither can those annoying birds (not good). To make matters worse, your pets (cats and dogs) will be able to hear them and be irritated by these sounds.

Ignore the Pitch and choose the right Frequency

Regardless of what the salesman pitched you on the effectiveness of ultrasonic devices, studies show that such devices have been ineffective in repelling birds. Ultrasonic bird deterrents generally emit sounds at frequencies above 20,000 cycles per second. Birds can hear sounds in the range of 60 to 15,000 cycles per secondmuch like humans.

Even if birds could hear ultrasonic frequencies, broadcasting sounds in that range would generally prove impractical since ultrasonic sounds attenuate far more rapidly than those in the audible range. The simple truth is that both lab and field tests have shown that ultrasonic frequencies do not disturb birds to any significant degree.

In one test, an ultrasonic device ran in continuous mode for 10 days and in a pulsed mode for another 10 days. The device was positioned near a ledge used by pigeons for roosting and nesting. Result: the pigeons were not deterred; they built nests and laid clutches within 7 to 20 meters from the ultrasonic unit.

In another test, an ultrasonic device producing 20,000 to 50,000 cycles per second was situated 10 to 30 feet from bird feeding stations. The manufacturer noted that the device would cover a 100 by 72 foot area. The ultrasonic sounds had no apparent effect on house finches, white-breasted Nuthatches, tufted titmouses, black-capped chickadees, blue jays or house sparrows.

In still another test, an ultrasonic device producing 22,000 cycles per second with a range of 150 feet failed to repel starlings. Finally, one ultrasonic unit, operating at 40,000 cycles per second had no real effect on birds that were even just a few feet from the sound source.

Choosing the right sonic bird deterrent

The best Sonic Deterrents generate distress and predator calls that birds can actually hear. And while they instill fear and panic in pest birds, the sounds they create resemble normal bird sounds to humans. Which means they wont irritate you, your neighbors or your pets.

Truly effective sonic deterrent devices will broadcast the sound of Peregrine falcons (a pigeon's dreaded enemy) defending their territory. Or theyll emit the sounds of predator hawks screeching and gulls under attack. One sonic unit currently on the market combines effectiveness with versatility. It emits distress and predator calls for as many as 22 types of birds. The calls are cycled through every 10 to 15 minutes. The best sonic deterrents have a built-in speaker, a volume control, and can be set to turn on or off at night.

For additional advice on how to properly choose sonic bird deterrents, consult an expert like the folks at Bird-B-Gone.

by: Alex A. Kecskes

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