I have a question for you. I was on a ride on a local trail in Ramona when I came upon a large swarm of what looked like bees but they were coming out of hundreds of small mud tubs completely covering the trail. Being mildly allergic to bee stings I opted to turn around and not press my luck by riding through them. Any Idea what they are and do they sting? I have never seen bees in mud tubs before wasps yes but these did not look like wasps. Any input would be appreciated. Thanks. Sorry I did not have a camera with me so no pics.