Bees Buzzing Around the Trees

At work yesterday afternoon, I got a call from Garrett on his cell phone. He doesn't say "Hello." He says, "I'll give you a million dollars if you can guess what I'm looking at right now!" It's not often I get such a straight line presented to me, and of course, I was so dumfounded I couldn't think of a thing to say. Feel free to contribute your snappy responses in comments for my future reference. It turns out he was standing in the yard looking at a gigantic ball of bees hanging from one of the Chinese elms. By evening they had gone away, leaving nary a trace behind. He took this picture for posterity.