I looked down.
You see it? Right under that leaf at the top of the picture. There's a hole - about 3-inches wide. It's their landing platform. 2 in. 2 out. 2 in. 2 out. They just keep going and going.
I've highlighted them for you. That little yellow dot and the hole to the right of him. I would have gotten closer, but this is where my DH pointed out that trying to get a close-up of a bee, when you're allergic to bees, is probably not a very good idea.
It's times like this that my DH comes in handy. I think I'll keep him.