Re: Window films increase avoidance of collisions by birds but only when applied externally
¿ªÔÆÌåÓýWindow strikes were a VARC focused project and we continue to work to get people to take action to make problematic windows safe. ? Window strikes are one of the top sources of human-caused bird mortality, despite being easily preventable and kill between16 to 42 million birds a year in Canada according to Govt of Canada stats. Glass can either reflect the natural surroundings or be transparent where bird habitat is visible on the other side like the many glass railings on decks in many homes. Because of the sheer number of windows in our structures, the toll on birds is enormous! ? You might think that applying bird-friendly solutions to all windows is necessary, but often, a small number of windows cause the majority of the collisions. ? Research has shown that birds will avoid glass window markers (dots, or vertical or horizontal stripes) but they must be spaced 5 cm apart across the entire glass surface. Markers should be at least 0.3 cm wide and should ALWAYS be placed on the outside surface of glass because strong reflections can overwhelm markers placed on the inside surface. We also know that individual bird silhouette decals don¡¯t work as birds will collide adjacent to them ¨C the covering must follow the 5 cm rule. The best DIY application we found was the one we used at our home on the north shore - the 3M strips of dots from Feather Friendly ¨C you can purchase it locally from WBU stores and once you get the hang of it, it¡¯s easy to apply ¨C if I can do it, anyone can! ? So please check out our dedicated window strikes webpage and see how you can take immediate action ¨C we even have a short video on the page showing how to apply the product with step by step instructions to follow: ? Thanks! ? Derek
? ? ? ? ? ? ? ? ? ? ? ? From: [email protected] <[email protected]> On Behalf Of Pamela Zevit via groups.io
Sent: February 7, 2023 3:29 PM To: Vancouver Birds list ([email protected]) <[email protected]> Subject: [vanbcbirds] Window films increase avoidance of collisions by birds but only when applied externally ? Related to Krista¡¯s note today about bird strike deterrence, this recent open access paper provides some important information on implementing window treatments. ? Window films increase avoidance of collisions by birds but only when applied to external compared with internal surfaces of windows ¡°We found consistent evidence that, when applied to the external surface of windows, the BirdShades product resulted in reduced likelihood of collision and there was marginal evidence of this effect with the Haverkamp film. Specifically, in our collision avoidance trials, BirdShades increased window avoidance by 47% and the Haverkamp increased avoidance by 39%. However, neither product was effective when the films were applied to the internal surface of windows. Hence, it is imperative that installers apply these products to exterior surfaces of windows to render their protective benefits and reduce the risk of daytime window collision.¡± ? Pamela Zevit RPBio | Biodiversity Conservation Planner ? T 604.590.7254 I am privileged to work on the shared traditional territories (t¨¦m:¨¦xw) of the s?my¨¢m? (Semiahmoo), sq??c?iy?a?? (Katzie), K?ik?????m (Kwikwetlem), q??¨»:n????n? (Kwantlen), Qiq¨¦yt (Qayqayt), Sc??wa¦È?n (Tsawwassen) and x?m?¦Èk??y??m (Musqueam). ? ? |
Derek Matthews