Articles
Written by Kawin Jiaranaisakul
Every year, millions of birds die because they fly into glass windows. This may sound surprising, but it is one of the biggest human-related causes of bird deaths around the world. The problem often happens in cities, but it can also occur in small towns and even rural areas. Although people usually do not notice, these accidents happen every day, and most of them can be prevented with simple actions.
Birds cannot understand the concept of glass. To them, a window looks like an open space or a reflection of the sky and trees. When they see the reflection, they believe they can fly through it. For example, if a glass wall reflects trees, a bird might think it is another forest area and try to fly there. Sometimes, birds also crash into windows at night because they are attracted to lights from buildings. Many migratory birds fly at night, and bright lights can confuse them, leading to fatal collisions.
Another reason is that some modern buildings use large glass panels to look beautiful and bright inside. However, the more glass we use, the higher the risk for birds. Even clean windows at home can be dangerous if they face gardens or areas with many trees.
When a bird hits a window, the impact is usually very strong. Some birds die immediately because of broken bones or brain injury. Others may only be stunned and fall to the ground. If no one helps them, they can die later from internal bleeding or from being attacked by predators such as cats. In some lucky cases, the bird may recover after resting for one or two hours, but this is not always the case.
If you find a bird that has hit a window, you can gently pick it up using both hands or a soft cloth. Place it in a small box lined with paper towels, and make sure the box has small holes for air. Keep the box in a quiet, dark, and warm place to help the bird calm down and recover from shock. Do not feed or give water to the bird because it may choke. Wait about one to two hours before checking again.
If the bird seems active and tries to fly, take the box outside and open it slowly to release the bird. Make sure there are no cats or other dangers nearby. If the bird is still unable to stand, breathe normally, or open its eyes, it needs professional help. Contact a local wildlife rescue center, veterinarian, or animal hospital as soon as possible. The sooner the bird receives proper care, the higher its chance of survival.
If you find a dead bird, you can still make a difference by recording the observation. Upload a photo to iNaturalist under the project “Bird-windows collision.” These reports help scientists understand where collisions happen most often and develop better ways to prevent them in the future. Even one record can contribute to bird conservation efforts.
birdmapper. (2014, April 09). Bird-window collisions. iNaturalist. https://www.inaturalist.org/projects/bird-window-collisions
Fortunately, there are many simple ways to stop birds from flying into windows. One easy method is to make the glass more visible to birds. You can place stickers, tapes, or patterns on the outside of the window. The marks should be close enough together (no more than 10 centimeters apart) so that birds do not try to fly between them. Another method is to use special bird-safe glass that reflects ultraviolet light, something birds can see but humans cannot.
Turning off unnecessary lights at night, especially during migration seasons, also helps. Some cities now run Lights Out campaigns to encourage people and companies to turn off building lights to protect birds. At home, you can move indoor plants or bird feeders away from windows so that birds do not try to reach them through the glass.
Birds are an important part of nature. They help control insect populations, spread seeds, and pollinate plants. When bird numbers decrease, the whole ecosystem can be affected. More importantly, birds make our world more beautiful and peaceful. Watching birds fly and sing brings joy to many people. Therefore, preventing window collisions is not only about saving birds but also about respecting the life that shares our planet.
The problem of birds hitting glass may seem small, but its impact is huge. Millions of lives are lost each year because of something we can easily fix. By understanding why birds crash into windows and taking a few simple steps, everyone can make a difference. Whether it is placing stickers on windows, turning off lights at night, or helping an injured bird recover, every small action counts. Protecting birds is part of protecting nature, and it begins right outside our windows.
The SPCA Serving Erie County, NY. (2025, May 3). Window Strikes. Facebook. https://www.facebook.com/photo/?fbid=1120885580075531&set=a.351333930364037
