Mud wasps are normally solitary wasps with females building their nest out of mud giving them the name mud wasps. The little mud nest may be constructed in or near your home, sheds, barns and similar places. Mud wasps have a long, slender body with a narrow waist and can be blue, black and may even have yellow markings. The nests are created by the wasp finding some moist mud that she then rolls into a ball to then transport to her nest site. The ball of mud is then used and moulded by the wasps mandibles into the nest. The three wasps that build mud nests are the black and yellow mud dauber, the organ pipe mud dauber and the metallic blue wasp. The black and yellow mud dauber wasps build multiple cylindrical cells that once constructed, will be covered with mud that they smooth over. The nests end up about the size of a persons fist. The organ pipe mud dauber constructs its nest by creating cylindrical tubes from mud that look like pipe organ pipes resulting in their name.