They’re not angry, hungry, scared or bored. Swarming is a natural event in the life of a bee colony and occurs in the springtime when food sources are readily available and the bee numbers are rapidly increasing. It’s a good sign, indicating that the hive is strong enough to split. The old queen and about two-thirds of the bees leave the old hive behind to search for a new home. Prior to leaving the old hive, they will make several new queen cells, so a new queen will be born and take over the remaining hive.