Bees on the Move!!

I feel pretty lucky to have this swam of bees gather in a tree right outside my door!  I stepped out and heard this loud, continuous buzz, I saw quite a few bees, but thought, no, the buzz is probably from machinery being used some where in the near distance, but no--how amazing!  My tree was buzzing, the bees were just starting to form this hanging mass!

Moments later, all was quiet--if I hadn't been outside while they were gathering, I never would have known they were there.  Somewhere in the middle being protected was the queen.  Now the scouts were looking for a new home.  About an hour or so later, I was dumping my compost and heard the buzz once again.  The bees were moving!  They flew pretty low--I ducked, but then ran to follow and saw them flying into the distance, holding together in an undulating shape--a bee bubble--they flew off toward a group of eucalyptus trees--where they all rose together and disappeared.  Wow--I saw this happen!