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I've always thought it wasI've always thought it was because their hearing was so much better than ours, they know what's happening in the walls, maybe outside the walls, and that's what they're staring at. Doesn't even have to be mice, just the occasional scratchy insect.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?