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Yesterday, I walked into the kitchen and found one of the hawks sitting on the deck railing right outside our sliding glass door. Grabbed my camera and got these images before it flew off.
Seems the hawk is seeing its own flection in our sliding glass doors and windows and thinks it is another hawk. Then it goes into attack mode, flies directly into the glass with claws out and wings fully extended. Awesome sight to see from our side of the glass. But it figures things out quickly and then just flies away.
It has been on our deck many times over the last few months and never attacked the windows, but my guess is, since they now have babies in the nest they are more protective of their territory.