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Well, it could be a swarm except after looking and checking - it seems she has a hive of bees inside her house. Now she has checked in the attic several times and no bees so they're somewhere between the bricks and the attic wall.
This is a large hive of bees, lots and lots of bees. In checking in the late afternoon and early morning, you can see where they're going in and out. There's a small crack between the brickwork and it looks like they have a route all set up. They seem pretty happy up there. Even had Steve, the neighbor beekeeper, come over and take a look. We really thought it was a swarm and he'd get a free hive - that's what you want - free. But this one isn't free and wouldn't be easy - whew! Don't know what she'll do - getting bees out of a house can be really, really expensive.
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So, if you see this on the side of your house - it could be a swarm (that's what you'd hope for) and a beekeeper would come right over to pick those girls up or it could be a hive and now you have a dilemma. I'll keep you posted.
Oh and if they swarm, you can believe I'll be right over.