I heard a crinkling sound in the wall near our front door. After a little Google search, I am 90% sure we have carpenter ants in our walls. We have a termite bond that covers ants too, but when I called the exterminator, the lady tried to convince me it was probably a rat in our walls (she swears carpenter ants don't make noise even though several reputable sites say they do and I even found a YouTube video of the sound). After I insisted, she said they'd check it out but there's nothing they can do about rats. It is not a rat. Ugh. Not a great day to be a homeowner.