You need to cover the window so she can't see her own reflection. She thinks it's another bird and she is trying to attack it. Very common behavior, cover the windows.

That is just so awesome. Not just to have the same female return, but to absolutely know it is her because of her unique color. I'm certain I have a different pair this year because they are very shy around me and don't come to the mealworm feeder when I call them. They won't go near it for about half an hour after I fill it. Also, this is the first pair I've ever had that built their nest out of short pine needles. In the past they have always used the long pine needles or grass.

Oh, how sad. Of course you are distressed. I believe you are saying all the eggs are still in the boxes? Do you have sparrow spookers up on the boxes? The only thing I can think of that would kill all 3 bluebirds, but not eat them would be house sparrows. Are you seeing any house sparrows now trying to use the boxes?

Nicole!!! How I have missed you! I have 12 day olds thriving so far. Hunkering down so no cute photos. Praying for their safety. Have you caught a glimpse of your two fledges? Fingers crossed! I had five eggs but only count four beaks so I don't know if there's another one in the pig pile or an unhatched egg somewhere. At any rate, will be doing much better than last year if second nesting survives.