Swarms are a bees way of creating a new hive.  A new queen is hatched and she takes off with about ten thousand of her closest friends and lands on a branch or wall.  The bees hang out while a few scouts look for a suitable place to call home.  They may hang out for a few hours or up to 2 days.

Here are a few examples of swarms I have run across

The bees are not flying around and thinking of swarming yet, but when they do in late May to early July, keep your eyes open and give me a call or tag me on Facebook.  I will come out and collect the bees, much like this!

And you will not only have the satisfaction of knowing you are helping save the bees, but I will gladly reward you with a pound of honey that looks like this.