We have noticed them off and on in the last few days. We can't really get close enough to see if they are honeybees or yellow jackets. But they will swarm the feeder (it's the kind that spins off squirrels) and go in the holes, just for a sec. They fly around probably 50 at a time, and seem to chase away the birds. The bees go away after a little while, and the birds come back. Then the bees come back - and so on. Has anyone seen this before? I wonder if they are hoping to make a home inside it? That would actually be cool, since we could see through it. I read one similar account online. Pretty interesting!