1. The Silent Sculptor: Carpenter Ants In Montana, Carpenter Ants are the #1 threat to log structures. Unlike termites, they don't actually eat  the wood, but they "excavate" it to build their nests. The Warning Sign:  Look for "frass"—which looks like small piles of sawdust—near baseboards or window sills. You might also hear a faint rustling sound inside the walls at night. The Fix:  Keep firewood piles at least 20 feet away from your home and ensure your gutters aren't lea