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[–]thomastheglassexpert 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

That's because birds do not "see glass" as a solid object. That's why "Bird Safe glass" is such a thing of recent years. See here = https://www.guardianglass.com/us/en/insights/quiz-bird-building-collision