Bird-friendly glass has patterns that make birds change course instead of colliding with it. Many of these patterns are never noticed by people but still save birds' lives.
The difficulty? It is impossible to directly ask a bird what it can see.
Instead, ABC's Tunnel Testing Program tells us how birds react to patterns on glass, information that is used to identify new glass and retrofit products that prevent collisions.
We test birds' reactions to patterned glass by asking them to decide whether to exit the tunnel via an “invisible” panel of plain glass or the patterned material being tested. A net safely stops the birds before they hit the glass.
See the Powdermill Tunnel in action! Discover Canada created this short film about ABC's glass evaluation program.
ABC's rating system assigns a “Threat Factor” or TF score, to materials tested in the tunnel. Low TFs indicate materials that most birds avoided in the tunnel.