Hello Gardeners, I’m Amanda McNulty with Clemson Extension and Making It Grow. Every year, my dear husband has to get mud dauber nests out of my free-standing sprinklers. Mud daubers construct a variety of nests of different shapes and sizes in which to rear their young. The most attractive and noteworthy are the organ pipe mud dauber nests. If you open a nest, you’ll find paralyzed spiders or insects inside. The female stings her prey, and places several victims in a nest, before laying an egg.