We stood at the back door and gawked--the area in front of one of the hives was boiling with bees. They were crawling out of the opening, climbing around and hovering around facing the hive. We had never seen anything like it and wondered if something (a mouse, maybe?) had gotten into the hive.
A 10 minute search on the internet yielded the answer.
Anyway, the info we found says they do this the same time of day. We're never home to see it, but it is sooooo cool, I'm going to take off work early on Monday to see if I can catch it again.
Until then, here's a youtube video we found that will show you just what we saw, except for the guy who kept putting his hand in the way. In our yard, it was me. :)
Disclaimer: This is video was just lifted from youtube, it's not mine. The one I post tomorrow will be. :)