Oh, they're out there, all right.
At our house, we have a small "mud room" attached to the back door of our walk out basement. We keep sunflower seed and millet in a large garbage bin in there - don't worry about keeping a lid on it, usually, because there's a second door between the "mud room" and the back patio.
Well yesterday, as I approached this room from the inside, I heard a rustling coming from the bin. As I started to open the door, a little chipmunk head, cheeks bulging, poked out of the top of the sunflower seed bag! It had, evidently, chewed its way into the mud room by enlarging a small gap between the floor and one of the walls, and been carrying off seed all day...
"Bad rodent!" I said - "Bad!" I doubt he'll pay much attention, though. I have now had to put the lid on, and weigh it down with a big bag of salt.