Black Vultures Get Closer

The Black Vultures I first spotted in May remain a fixture at our office park, much to the consternation of Facilities Management.  What is worse, from their standpoint, is that the two birds are a great deal more tolerant of people and will stay on a ledge even inches from workers on the other side of the glass.  This has afforded me the chance to teach about vultures to the witnesses.  But I am awfully puzzled by these characters.  Where is all the carrion they are eating?  By the way they hang about the buildings one would imagine that we are up to our armpits in animal carcasses!  The mystery darkens.  Meanwhile, I can enjoy a rare close encounter...daily!