I have a concrete path and there us a gap of about 5/6 inches before the fence. Bees are flying under the concrete path. Do I need to worry or should I just leave them.
You don't need to worry about them - they are mining bees, and will only sting if you threaten their nest. Just go about what you are doing in the garden and try to ignore them, and they will ignore you.
Thanks everyone. They do not bother me at all, and as roopower said it is interesting watching them come and go. It gets really busy sometimes. I never realized that they would do that, always thought it would only ge a hive.