Strong healthy honey bee colonies use the swarm process to created new colonies, it is generally a sign of a good year.  A strong colony can have 40-60,000 honey bees, when they get crowded the old queen and up to half of the existing bees will leave to find a new home.  When the swarm first leaves they usually find a temporary location to land while they scout out a permanent home.  The temporary spot can be almost anywhere but is most commonly a tree or post within a short distance of their original hive.  Once they have agreed on a new home they all head that way typically within a few hours, rarely staying overnight in the open.

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