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Straw can get moldy when wetStraw can get moldy when wet and mites seem to like it because it has hollow stalks. Hay is better, however they will get used to the shavings. Try putting down some treats with the shavings, like dried mealworms. I think mine would walk through fire to get them!

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