Question about unusual movement I saw a bee do

[Bee Curious]

Hi folks,

I got my first package bees 2 weeks ago.  I took a look in the hive today to see how they were drawing comb on my foundationless frames (answer: messily.)  I'll go in and try to straighten that on a nicer day when everybody isn't home. Today was cloudy and cool, like it's been too many days since the girls arrived.

Anyway, while I had the inner cover off, I twice saw (it could have been the same bee or two different bees, I'm not sure) a bee between the the frames, at the top of the comb, bouncing her abdomen up and down repeatedly in an eye-catching way.  Does anyone know what that is?  I had so much to look at and look for, I didn't watch for long, but the movement caught my eye a couple of times.

[don2]

Google "bee dance" :) d2

[Bee Curious]

I don't think it was the waggle dance for three reasons:

The bee wasn't moving around on the comb while doing the movement.
The bee's tail end was just moving up and down, like from the comb below her and up into the air, over and over.
Lastly, it was a dark cloudy day, and the girls weren't flying for pollen.

[JWChesnut]

Bees clean their pollen basket by rubbing their rear pair of legs together.  Their abdomen moves when they do this. Take a movie to upload, or be a little more descriptive than "eye catching".

[Better.to.Bee.than.not]

I've seen this also, it is almost as if they are tapping their stingers on the ground repeatedly. It might be cleaning their pollen baskets as I've seen it mostly while they are getting water on the fountain I set up for them, so could be using that water to clean themselves.