the.com/pillbug
the only crustacean that ditched the ocean and learned to roll into a tiny tank.
not insectIt's a crustacean, kin to crabs and lobsters
gill breatherBreathes through gills, needs damp to survive
blue bloodCopper-based hemocyanin tints its blood blue
metal eaterStores heavy metals others find toxic
backward birthCarries young in a fluid-filled belly pouch