Could It Be Rodents In The Walls?

While they didn’t know what was causing the sound, they did decipher that it was coming from inside the walls. Based on this deduction, they came to the conclusion that it could be rats living in the walls.

Rats in walls isn’t an uncommon thing. Rats thrive in dark spaces, hence why they like to be in basements, attics, and also the cavities between walls. The most apparent evidence of rats is discovering chewed wires, but to the homeowners, the primary evidence was that the noise was getting louder, meaning it was more than one rodent.