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I saw this on reddit a few weeks ago and it actually had useful comments: https://www.reddit.com/r/AnimalsBeingBros/comments/dwj7i3/a_72_year_old_retired_man_fr

• floatingatoll 7y ago
  Relevant top comment: > So this looks really cute and all, but what she's doing is nesting, and once she fills that box with hard stuff, she adds tufts of her own fur and possibly other soft stuff like fiberglass insulation or the stuffing from car seats, then she has her babies in there, all the while peeing all over those parts and causing them to rust and smell like mouse piss for ever more.