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.
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 –
"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 –
“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 –
“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