Wow! I'll bet that hurt!

While I was upstairs getting ready to go out my wife and heard a huge bang and assumed it was the two Burmese having a battle and gone into the patio window ~ let me explain that we live in the middle of town with two storeys one side and three the other, so our patio window is really first floor level.

As we were leaving I checked the window to see that it was locked and noticed the print on the glass. There is no bird outside so if it was a pigeon the sparrow hawk got it. But was it the  pigeon or the sparrow hawk that hit the window?

The tape is 24" so the bird possible had a 30" wing span, the wing ends are interesting and the beak should be the decider ~ but I am not sure.

So can you detectives please help me?

David