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| | Item #: | WA00005 | | Price: | $6.97 | | | |
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Pack of 4 Window Alert Decals - Hummingbird Design
Decals are approximately 4 1/2" in diameter.
Protects wild birds from windows (Also effective for indoor flighted pet birds)
PROBLEM: Birding enthusiasts share a similar problem: wild birds fly from backyard trees and feeders into home windows where they are injured or die. Wild birds also collide with office windows. In North America alone, tens of millions of wild birds die in this manner each year.
SOLUTION: WindowAlert is a static-cling decal that may be applied to home and office windows. The decal contains a component which brilliantly reflects ultraviolet sunlight. This ultraviolet light is invisible to humans, but glows like a stoplight for birds.
Most Effective Placement
Here are three ideas to help you when placing your decals:
1) Bird strikes often occur when birds can see through one window, across the inside of your home or office, and out another window. In short, they think they can fly through your home or office. In this case, position your decals to block this line of sight.
2) Bird strikes occur when birds see open sky reflected in your window. This may occur, based on sunlight and the time of day, in certain windows of your home or certain areas of a large window. Use the decals to break up this reflection of open sky.
3) Male birds often stake out a particular territory. When they see their own reflection in your window, they mistake it for an intruder and attack. This is particularly true of the Northern Cardinal. Place the decals on the window under attack.
HOW TO APPLY:
Clean glass with water and cloth (do not use window cleaners or soap.)
Decal and glass should be warm. During winter months, clean glass with hot water.
Place on exterior side of glass. Interior placement is possible, but is MUCH less effective.
Suggested placement: 1 or more decals for every 3' x 3' area of glass.
Decals will degrade over time based on exposure and local elevation. Depending on these variables, replace decals every one or two years.
About Bird Vision...
Birds enjoy sharper vision than humans. Birds can see certain light frequencies--including ultraviolet--that humans cannot see.
In fact, many songbirds have feathers that reflect ultraviolet light. This light is used to communicate species, gender, and perhaps even social standing. Birds can see this ultraviolet light under normal, daylight conditions. Humans require the assistance of a black light.
Why do birds see better than humans?
1) Both birds and humans have photoreceptive 'cones' in the retina located at the back of the eye. These cones allow us to see color light. The human eye contains 10,000 cones per square millimeter. Wild birds have up to 12 times this amount or 120,000 cones per square millimeter.
2) In humans, these photoreceptive cones consist of three types. Each cone is sensitive to red, green, or blue light. This is called trichromatic color vision. Birds have an extra cone for quadchromatic color vision. This extra cone expands the visible light spectrum, allowing birds to see ultraviolet frequencies.
3) During low-light conditions, both humans and birds rely on photoreceptive ‘cell rods’ in the retina. The human eye has 200,000 cell rods per square millimeter. Some birds, such as owls, have up to 1,000,000 cell rods per square millimeter.
4) Bird eyes, on average, account for 15% of the mass of the bird’s entire head. Human eyes, by contrast, account for less than 2% of the head.
5) Bird retinas, in contrast to humans, contain no blood vessels. This prevents light scattering and thus provides birds with greater visual acuity than humans.
In sum, your favorite wild bird will notice WindowAlert decals the MOMENT you place them on your window.
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