What is a swarm?
A new honey bee colony is formed when the Queen bee leaves the colony with a large group of worker bees, this is called swarming. A swarm can contain thousands of bees and usually happens between May and July depending on the locale, but occasional swarms can happen throughout the producing season.
The swarm when flying can darken the sky and may land on a tree, fence, wall, roof of a shed etc, but once they have landed, they will often form a football sized pear shaped mass, they may remain here for hours or days, but if the weather is fine, they will usually move off within a few hours.
You should therefore report the swarm as quickly as possible, allowing time for a bee keeper to come and safely remove the swarm.
Do I have a swarm?
Follow this link for advice http://www.wbka.com/swarm-help/
If, after looking at WBKA website you suspect that you have a swarm of HONEY BEES please see the attached list for swarm collectors in your area.