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. Songbirds, for example, 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 songbird will notice WindowAlert decals the MOMENT you place them on your window.

Testimonials

“Great product! With many birds attracted to the feeders around my house, flying into windows had been a problem in the past, but since I put up these decals, not a single bird has flown into a window. EVERYONE should use them!!!” Patricia – Monroe, CT

“I work at a car lot with a lot of glass. We've tried a lot of products and nothing has been as successful as WindowAlert in preventing unnecessary bird deaths.” Tony – Lexington, KY

“I received my order from last week- it's great. Please send me 50 more - we're also telling friends about them.” Debra – Seville, OH

"Last summer we purchased and installed your WindowAlert decals and we are elated with the outcome. Prior to the installation we were finding 12 to 18 dead birds (of all species) per year under our large picture windows. This was very disturbing to us as we built our mountain cabin to be in and with Mother Nature, and here we were killing it off. Since we installed the WindowAlert decals, we have had NO bird deaths, the decals really work. We highly recommend them. David and Nancy - Boulder, CO

“I hope your product helps me as I had a FLYING, WILD TURKEY break a second-story window that cost $5,000 to replace. The turkey broke the outer glass of the thermo and walked away, a bit shaken. Please rush my order and thank you.” James – Williamsville, NY

“I ordered the Window Alert decals about a month ago. Since then we have not had a single bird hit our windows! Prior to this it was a weekly occurrence and quite often the birds died from the impact. Yesterday I noticed a hummingbird hovering in front of one of the decals; it hovered left to right and back and forth as if it was trying to determine what the decal was -- so the birds do actually see the images! We have two enormous windows on each side of the fireplace, and we placed 6 decals on each window. Our property is on the banks of the South River and there is a forest between our backyard and the water....so we have lots of birds. I am so relieved that the birds are no longer slamming into the windows. It broke my heart every time I heard the "thud." Thank you so much for offering this fabulous product!" Barbara - Annapolis, MD

“At first I only had two WindowAlert decals on one of the windows and a bird did hit it, but not hard, and flew away. After I put all four decals on each window, we haven’t had a bird attempt to fly through the windows. The decals are transparent and do not interfere with the view. This is a great product and I would recommend it to anyone who is concerned about the loss of birds flying into windows. Thank you.” Juanita – Madras, OR

“I think this is a wonderful idea and wish many more folks knew about it...I will be telling others and hope you make it a point to do so also…” Lynn – Stanwood, WA

“A very good product. Excellent customer service.” Warren – Tomahawk, WI

“I am buying these as a gift for my parents. They have several bird feeders and large windows.” Paula – Orange Park, FL

“What a wonderful idea! Great for Christmas...” Susan – El Cajon, CA