I am getting ready to sell my house, and every spring these black caterpillars take over the south side of my house by the front door. I want to power wash the outside of the house, but I would hate to disturb these guys if they are anything other than pests. They showed up a week ago after a giant rainstorm in SoCal. There's easily 20-30 of them, all on just the southern wall of my home. They are in varying stages of cocooning so I've included a picture of their cocoons (crysallises?) as well. I don't remember seeing any butterflies around my house except for small yellow ones, some gray moths, and every once in a while beautiful yellow, black, and white striped ones. So, help me figure out what they are so I know whether I should get rid of them or try to move them somewhere less visible.