Vanity?

I watched the wee bushtit in the courtyard behind my apartment for awhile before I figured out what she was doing.  She was flying from the Rose Barberry bush to the parked car, perching at the window, then on the side view mirror, looking this way then that.  She was looking at her reflections!  She must've been enjoying this activity, as she went back and forth from bush to window to mirror again and again.  I was mesmerized.