We've had a lot of window smashes this year (5 or 10 a day) and it pained me to see all the carnage. So I just taped them to the sliding glass door closest to the feeder and didn't hear a knock today. Very easy to apply and the butterflies do a great job of catching the sunlight. Edit: It's cloudy today and that seems to have changed the reflections. 15 or more collisions in the last 3 hours - although they don't seem that big.
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