Monday, August 27, 2012

Ultrasonic Bird Control? Don't Throw Your Money Away!

Sometimes hardware or lawn & garden companies advertise ultrasonic devices that are supposed to drive birds away with high frequency noises undetectable to humans.  Sounds like a good idea, right?  Blast out sounds birds can hear but we can't—what's not to like?  Unfortunately, the truth is that birds do not actually hear these ultrasonic sounds any better than humans do, and there is no scientific evidence that these devices actually work. The bottom line is that birds cannot hear ultrasonic frequencies and ultrasonic devices don't work.

Humans hear sounds between the frequencies of about 20 to 20,000 acoustical vibrations per second (hertz or Hz).  Middle C is about 262 Hz and the highest piano key (C8) is about 4186 Hz.   As you get older, you lose the higher frequency sounds; middle-aged people can often hear sounds only up to 12,000-14,000 Hz (12-14kHz).  High frequency dog whistles work because dogs can hear sounds up to 40-60 kHz.  Bats use sounds up to 100 kHz to help them locate their flying insect prey and avoid obstacles in the night sky.

Birds, on the other hand, usually hear best between 1-5 kHz, with total hearing between .5 and 8 kHz.  There is a huge amount of variation between species.  Some songbirds—especially those with high pitched songs—can hear up to about 20 kHz.  There are some discrepancies in studies of the upper limits of bird hearing, but in the most recent tests, no birds have been shown to hear frequencies above 20 kHz.  Even birds like oilbirds and swiftlets that are known to use sound for echolocation in dark caves only use audible sounds between 1 and 15 kHz. For this reason, ultrasonic devices using frequencies between 15-30 kHz are completely ineffective save for a few songbirds.

While birds may not hear higher frequency sounds any better than people do, a few including pigeons and owls may actually hear lower frequency sounds better.  In 1979 researchers discovered that some pigeons can hear sounds as low as .05 Hz.  That's the kind of low infrasounds created by earthquakes, winds over distant mountains, or waves on distant shorelines.  Some researchers have speculated that these birds can use these distant sounds to help them maintain a general sense of direction.

So before you buy an ultrasonic bird scaring device costing several hundred dollars, remember this general rule: most birds hear about as good as you do—even with your middle-age hearing loss!

Tuesday, April 17, 2012

The Myth and Truth of Red Bird Nest

Heading deeper within the cave, the nests are yellow in coloration and in the vicinity of the deepest stop golden red colour.

The coloration of genuine yellow and red bird nest is because of to interaction of the nest with the cave wall and absorption of the normal minerals identified in the wall. A red nest with uniform yellow and red shade is almost never identified since only 1 facet of the nest is in make contact with with the cave wall. It could be because of to the swiftlets feed on red algae. In such a situation the color of the nest is grayish pink as an alternative of simply yellow or red.

There is an additional rumor namely the red nest is built by the residence swiftlets. This is entirely untrue as the home swiftlets only feed on insects and not algae. Only cave swiftlets make red nest. No matter if it helps make the nest for the first time or many instances, it produces only an individual kind of bird nest namely white 1. The rumor may well be spread by the unscrupulous businessmen who adulterated coloration into the white nest or make the white nest becomes red 1 by fumigation.

In conclusion, one particular should be watchful in choosing red nest as the normal an individual might bring gains even though the fake a person could bring about damage to one's wellbeing.

Beware - this incredibly revealing report may contribute to you catching several far more major fish as a end result of you taking far more interest in your baits from this minute on! When you believe about the achievements of the effectively-acknowledged carp bait additive Robin Red you may not realise that it could have selected detrimental impacts on wary carp that are all also acquainted with it but you can alter Robin Red to make it different and execute even superior to obtain a carp fishing year you will generally keep in mind!

You might know that Robin Red is a bird foods applied to carp fishing for all the good results it has on carp wellness and on feeding responses and so on. As the majority of prepared built bait makers use it in at minimum an individual bait in their assortment - commonly a red bird food type bait or even a fish meal or meat type bait or types of ground baits, around the decades it could have facet effects with some fish. What I mean is that our baits are meant to attract carp and induce them to feed as confidently as doable, but what if an ingredient is so clear and distinctive to carp that it reminds them of many prior experiences of receiving hooked?

You may believe this may possibly or might not be a likelihood, but as they say, the greatest edge in carp fishing is being different. There are numerous substitute Robin Red form solutions out there. Specific variations I have utilised have fished just as perfectly as the original version when fished facet by aspect, but then the variations I have utilised have been either constructed by bait makers with in excess of 40 decades practical knowledge or have been personalised by myself.

There is no doubt of the efficiency of the original substance however and its versatility as a bait additive is actually constrained only by your imagination.