The last few days I have noticed vehicles with bird droppings on their doors. Turns out there is at least one Song Sparrow that is infatuated with its reflection!
I tried to catch it looking in the mirror but it stayed on the far side of the truck. I could see it drop to the front of the mirror, sit for a couple seconds then move back to the top. Although it did not go to the other mirror while I watched, there was evidence it had been there!