solar panel bug

I have this toy bug.  My friend R in Pittsburgh sent to to me.  It has a solar panel on it, and it lives on our kitchen table.  At a certain time of morning, as the sun shines in the larger kitchen window, the sunlight on the solar panel gets warm or direct or intense enough, and the bug begins to vibrate.  It makes a funny buzzing sound on the table.  Sometimes it vibrates off the table.  But today it's staying in place.  It looks really weird.

Just now it vibrated itself into the shadow of a banana.  So its fun for today is over.  It will have fun again tomorrow morning.