Isopods.

Some people call them Rolie polies. Others call them sow bugs, pill bugs, or wood lice. Whatever you call them, isopods are small crustaceans. They breathe with gills, and they’ll eat anything from dead leaves to lizard poop. Use them in your bioactive terrarium or vivarium to keep things naturally clean. Great for reptiles, amphibians, and even other inverts.