I just moved back into my parents place (I know, total winner. Oh,did I mention I'm single ladies?) Since I have lived here previously, a tapping has started. This tapping happens randomly, day or night, and can be heard at any given point in the house. However, We have pinpointed the tapping to the east side of the house. The wall has no pipes in it, and nothing attached to it. Also, there are no animals around. (We checked vigorously) Suggestions?