Bird is the Word

For the past 1 1/2 weeks we have had a Towhee bird trying to break our dining room window.  It is relentless at throwing itself against the window.  It seems to start around 6:30am and will continue for 10 minutes, then a small break and the bird is back for another round.  It will fly away when it see's one of us approach the window, but it doesn't last long.  It's starting to make a mess of the window.  We took down the screen since it was using that to hold onto to tap the window, now it's just flying it's beak and chest into the window.  Ellie has learned to ignore the constant tapping and banging on the glass.

Here is picture I took last week before we took down the screen:

I've researched some bird forums and have found that this is normal behaviour during the spring and shouldn't last longer than 2 weeks.  It's either trying to defend it's territory from it's reflection or it's trying to mate with it.  Either way, I'm not opening the window.

Closing the blinds only forces it to move onto the next window.