I am not sure what type of bee this is. I have a pond, and these bees appeared this past week and are swarming around near roots at the edge of my small pond. Are these bees that are "good" or are they wasps I need to be concerned about? We have two dogs and the bees don't seem to be concerned with them when they go near the nest. They are hard to see in the photos because they blend in with the roots, but if you zoom in, you can get a good view of them. Thank you for any info you can provide.