I did not have my doors or windows open when I heard a sound coming from the fireplace. When I went to investigate it scooted out of the fireplace, down one hall and into the bedroom, then bathroom and finally the shower. It was a cute little squirrel that somehow got into the chimney flute and down to the fireplace. What I did was open bathroom window, took screen off, opened shower door, then closed bathroom door. Went back a couple of hours later and he was gone.