Our study asks two overarching questions: first–what aspects of a bird’s biology might make them more likely to fatally strike windows and second, what characteristics of a building’s design contribute to bird-window collisions. To evaluate our window collision data in context, we collected weekly data on local bird abundance in the adjacent parkland. We collected and analyzed 5 years of window strike data from a 3-story building in a large urban park in San Francisco, California. Additionally, few available data can critically evaluate factors such as time of day, sex and age bias, and effect of window pane size on collisions. In North America, studies of this topic tend to be focused east of the Mississippi River, resulting in a paucity of data from the Western flyways. Bird-window collisions are a major and poorly-understood generator of bird mortality.
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