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ABC (American Bird Conservancy) director Dr. Christine Sheppard talked recently on NPR about her research on how birds see...or don't see the glass in buildings. Sheppard says birds don't see the way we do. "Reflection is definitely a problem," she explains. Most birds don't have good depth perception beyond their beaks — they have to get relatively close to an object to see much detail or distinguish it from background. Reflections in glass can make it seem as if there's no building there — just more sky, clouds and trees.