[Maine-birds] Bluebird behavior concern

My neighbor in Liberty has been concerned about a male Bluebird that repeatedly flies into her windows around the same time each afternoon. She has taped them with big x's; and gently tried to discourage it in other ways. There are trees across the road that are probably reflecting in the windows but this bird has kept at it most days for over a week. I just suggested she hang a sheet inside the window to dampen the reflection. 

Any ideas? 

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