Wild Geranium

I saw this single bloom toward the back of the yard, facing the sun, so I took the picture from its backside for a little different angle. I think it's equally pretty when seen from either side. 
We had another young robin get in trouble today, but the window it flew into was in the garage, and it didn't hit very hard. Tom picked it up and carried it back outside, where it promptly flew off. We're wondering what the heck is making them fly into the windows, as I've never seen the robins do this before!  :(