Mud daubers have extrremely long, think waists and are blue to metallic black in color. Their nests are a series of mud cells which often resemble finger-like projections. The adult female provisions the nest with paralyzed spiders for the young to eat. They are not social wasps and the female leaves the nest after she provisions it. The adults are much less likely to sting than the social wasps. . The adults will abandon the completed nests which may be simply scraped off the substrate and discarded. It is suggested that the nests not be brought into the home because the young mud daubers may emerge from the nest.