Vultures circling

So, I often see vultures making lazy circles around me, and joke with them about how I'm not dying yet, but on an October hike at Skyline Regional Park in Arizona, I was on a high ridge and they started circling RIGHT above me.  So close I could clearly see their eyes.  First four, then five, then seven.  At one point there were thirteen.  Circling, circling.  

Usually there's only three or four.  Usually they're not so close.  Usually they don't circle for 15-20 minutes.  I admit, it was a little creepy.  I even called out and looked around to see if there was anyone really in trouble.  

I think there were just good currents that day, and they were having fun.  

Thanks, vultures, for the awesome show.