Flight is both a gift and a curse for the honey bee--during the summer, foraging bee's wings will wear out in a matter of weeks and the bee will die. One of the bees in this picture is laden will pollen, which will provide protein to the hive.
A swarm of bees settling on a roof is an omen that the house will burn down. If a bee enters your home, it's a sign that you will soon have a visitor. If you kill the bee, you will have bad luck, or the visitor will be unpleasant.