Warning Web (WWM)


Warning Web (WWM)



Prevent bird strikes with the Droll Yankees Warning web. The Warning Web is a patented method of preventing birds from colliding with windows. The static cling decal can be placed on the inside or the outside of the window. Birds will avoid the window thinking that it is a spider web.

  • 8″ x 8″ static cling
  • Spider web shape warns birds away from windows, helping prevent birds from flying into windows
  • Scientifically based
  • Practically disappears when on window
  • 2 pack
  • Made in the U.S.A.

Droll Yankees Warning Web® – Helps to prevent bird strikes

How does it work?  The Warning Web is a patented method of preventing birds from colliding with windows. The static cling decal can be placed on the inside or the outside of the window. Birds will avoid the window thinking that it is a spider web.

What is a stabilimentum?  The stabilimentum is the prominent white zigzag in the center of an orbital web. Originally, scientists thought that the purpose of the stabilimentum was to stabilize the web – thus the name. They have since determined that spiders place the stabilimentum on the web to make it visible to birds and large flying insects to prevent its destruction.  Birds in flight will swerve to avoid a sticky web. This interaction has served the mutual benefit of both spiders and birds that have evolved together for hundreds of millions of years. (Spider Web Protection Through Visual Advertisement: Role of the Stabilimentum, Thomas Eisner and Stephen Nowicki, Science Vol. 219 (4851) pp 185-187, Jan. 1983)

What is an orbital web?  Spiders construct orbital webs by running radial threads from the center and attaching them to a frame. Then a sticky thread is placed over this frame spiraling inward towards the center. The orbital web is designed to catch flying insects. Many orbital webs are put up in the evening and taken down at dawn, but the ones left up during the day are likely to have a stabilimentum. (A Guide to Spiders and Their Kin, Herbert W. Levi and Lorna R. Levi)

Which spider makes the stabilimentum shown on the decal?  The Golden Garden Spider, also call the Black and Yellow Spider (Argiope aurantia) was chosen as the model for the decal. It ranges over the continental United States and southern Canada but is not common in the Rockies. Stabilimenta are produced by spiders of the two major families of orb weavers, Araneidae and Uloboridae. Some stabilimenta are a linear pattern (the Golden Garden Spider), some are an X pattern and some cover a disc. (The Audubon Society Field Guide to North American Insects and Spiders)

What if there are no spiders like that in my area?  Chances are good that there are orb weaving spiders in your area which display a stabilimentum but you will see them only at certain times of year. The Golden Garden Spider, for example, is seen only in late summer and fall. Migratory birds traveling through different areas are affected by the spiders they encounter along the way.

How many decals should I put on a window?  On an average size window, one decal should be enough. A sliding door or a large window may need two or more decals. The number needed will be determined by the placement of your bird feeders, the location of trees and shrubs, the way the light reflects on your windows, and various other factors.

Will the decal stop all bird collisions?  It has been estimated that as many as one billion birds die annually from hitting windows. Many of those are killed by colliding with lighted buildings while migrating at night. In the case of birds around our houses, no method is perfect, as nothing can prevent the panic flights caused by hawks and other predators. If you work in or near buildings that are left lighted at night, please help educate those who influence that decision.

NOTE: This decal is not recommended for use on coated (Low-E glass) windows as it may damage the coating.

Dimensions 8 x 8 x 0.5 in

Apply to window


Plastic decal

Where should these be placed on my window?

The majority of the window needs to be covered with decals, placed less than four inches apart.

Do the decals remain effective or do they need to be replaced?

The Warning Web will not become less effective in preventing window strikes over time. We recommend replacing the Warning Web if it becomes less easy to apply to your windows.


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Frequently asked questions will be answered in the FAQ tab of the product page. Click here to read our company's FAQs. For customer service inquiries, please contact drollbird@drollyankees.com.