This last week I've noticed some odd behavior from my girls. I often find 5 or 6 bees on the landing board doing a "Two Step". They will move straight forward about two steps and then immediately move straight back two steps. They will keep doing this for a good 10 minutes before they get bored. The entire set of moments takes about a second to take place. It's almost as if they are rocking forward and back on their legs to a rhythm. It's a very consistent set of movements. I also have a small entrance hole higher up on the hive and I find girls behaving the same way around the entrance hole.
Any idea as to what this might be?
I notice some girls (Carnies) in front of the hive entrance fanning outwards, so I raised the inter-cover at the back of the hive about 1/4" to give them a little extra ventilation. I don't believe this rocking motion is related to the heat, but I might be wrong.