Glass Collisions

Downloadable Resources

Anna's Hummingbird ©In the Light Photography/Shutterstock

American Bird Conservancy's Bird-Friendly Resources

Knowledge is key to reducing bird collisions. At American Bird Conservancy, we're dedicated to providing the public with the information and analyses necessary to prevent bird collisions.

Our library contains a collection of materials produced by American Bird Conservancy that offer guidance based on both science and experience. 

To find materials, you can scroll through the adjacent listing or use the search feature below.

How to Search Our Resource Library

Finding materials is easy. You can scroll through the adjacent listing, search by title, or sort alphabetically or chronologically using the dropdown atop our listing.

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Spreadsheet of Bird-friendly Materials: November 2021

Spreadsheet of bird-friendly materials, including descriptions, Threat Factors, sources, and other information.

Collisions Guide from the Glass Traps Foundation of Poland

Polish-language Collisions Guide



Guide to Prescriptive Rating for New York City LL15

American Bird Conservancy Model Bird-Friendly Building Ordinance

Basic language to use as a basis for crafting new legislation or evaluating proposed or existing legislation.

AIA Continuing Education Class: Mastering Bird-friendly Design

This class focuses on materials used in bird-friendly design and the legislative landscape architects now encounter.

Bird-Friendly Glass and other Materials

An overview of materials commonly used in bird-friendly design, including glass with fritted, printed, etched and UV patterns, spandrel glass and sunshades.

The Powdermill Test Tunnel

A brief description of the tunnel test, from acquiring birds to calculating a Material Threat Factor.

Summary and Comparison of Glass Testing Protocols – Seewagen

A Review Of Experimental Methods Used To Test The Effectiveness Of Bird-Deterring Glass. This survey includes early work by Martin Rössler at Hohenau, Dr. Dan Klem at Muhlenberg College and ABC at Carnegie Museum's Powdermill Avian Research Center.


Side 1 or Side 2? Where should collision deterrent patterns be placed?

A discussion about how placement on different layers of glass makes patterns more or less effective at reducing collisions. Also discussed are other factors that influence effectiveness – no single factor is ever the entire answer!

Save Birds: a review of solutions for existing glass

This one-pager briefly describes the basics for stopping collisions on existing glass and lists the types of solutions and where to find them.