Birds face innumerable threats in our human built environment and our glass surfaces are one of the biggest.

During daylight hours, birds collide with reflective surfaces when they stop to feed or rest, when avoiding a predator or flying from tree to tree. Shiny glass exteriors, internal plants near windows, glass corners, and greenery close to buildings can all be deadly as birds are unable to distinguish reflection from open flyway. For every collision victim found, three more typically go unseen, flying out of sight before falling or being carried away by predators.

Window collisions are one of the leading direct human causes of bird mortality. A 2014 study by the US Fish and Wildlife Service and the Smithsonian Institution estimated that between 365 and 988 million birds are killed annually by building collisions in the U.S.

To determine the extent of the problem in our area and if there are any buildings that present a serious problem for birds we have developed this Bird Friendly Buildings section of our web site.

Bird-building Collisions

Data for this map is collected crowd-sourced by people like you. If you find a bird dead or injured by a collision with a building you can enter the data in the form below. Or you can collect data in the field with Survey123, a mobile app that works with iOS, Android, and Kindle devices.

Download the Survey123 field app for your mobile device.


When you've downloaded the app, open this link on your device:

Click on Open in Survey123 field app.

The Bird vs Building survey will open in Survey123.

When you find a dead or injured bird. click Collect. A form similar to the web form below opens. Zoom in on the map to the location of the bird and fill out the other required data. If you get a photo of the bird you can upload it as well. Shortly after you submit your survey report, the location data will be mapped.