My guess would be it's in the moss or Aspen you're using. It's not unheard of to find spiders, flies, beetles, and various critters in packaged bedding. If you're feeding frozen/thawed mice, you'll not see that, and even feeding live mice I've never seen anything like that on them before. I've seen ticks and mites on mice but not that. And for the record, that is not a worm. It has legs. It is a larvae of some sort, probably some kind of fly or beetle.
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