Pill bugs don't just use the minerals they eat—they rebuild them inside their bodies

Placing small stones in a bug cage is beneficial when raising pill bugs, a type of woodlouse. Researchers at the University of Tsukuba have discovered that pill bugs do not directly incorporate ingested calcium carbonate (CaCO₃) minerals into their tergite cuticles. Instead, they undergo an energetically costly process to reconstruct these minerals within their bodies before forming their tergite cuticles. This finding helps explain how organisms biologically control mineral formation. The research is published in the Journal of Structural Biology.