Earlier I wrote:
> Usually the striped brown bees congregate among the lavender
> while the larger black bumble bees forage the salvia bush.
> Today I got the round-the-world processional flyby from both
> tribes. It was wonderful!
I think I figured out what that processional was about. The bees were at best minutely interested in the ape who made it rain softly. What they seemed to be doing is discussing which bush each tribe would use for the day, because after a couple of hours I notices the black bumble bees were working the lavender bush this time, and the striped brown bees forages in the salvia bush.
I wonder how they eventually choose and how often this occurs. I have never seen both bee tribes intermingle.