Hasbrouck Heights, NJ Inspection

Sometimes you may see an unexpected guests even inside the furnace. The nest of the black and yellow mud dauber is a simple, one-cell, urn-shaped nest that is attached to crevices, cracks and corners. Each nest contains one egg. Mud daubers rarely sting humans and only do so if handled roughly or attacked. For this reason, it is often advised to leave them alone and not get rid of them. They get rid of flies and spiders and are generally harmless to humans, but not in a furnace, because mud nest can interrupt normal function.