Woodlouse's 300 Names and Hidden Heavy-Metal Superpowers
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- The common woodlouse has collected more than 300 regional names in Britain alone — including roly-poly, slater, cheeselog, and the Welsh "Gwrach y Coed" ("witch of the wood") — reflecting centuries of easy cohabitation with humans.
- Woodlice sit within the order isopoda, a suborder of roughly 5,000 crustacean species whose ancient ancestors moved onto land approximately 500 million years ago, well before most animals.
- Sally Roe, a Guardian reader, found a woodlouse colony had hollowed out a solid bamboo kitchen offcut she'd used to weigh down cardboard in her pumpkin patch, turning it into a "paper-light wood honeycomb" — concrete proof of the detritivore's appetite for rotting plant matter.
- Studies cited by The Guardian show woodlice can store heavy metals within specialized compartments in their bodies and help stabilize those metals in compost.
- Porcellio scaber, the common rough woodlouse, ranges further than the common woodlouse — across South America, Australia, Europe and the US — but unlike its relative cannot roll into a ball, a defense behavior zoologists call conglobation or volvation.
- The Guardian's "Invertebrate of the Year" competition runs August 3 to August 12, profiling reader-nominated species before opening voting.
Why it matters: The woodlouse's quietly powerful role — storing heavy metals and aggressively breaking down biodegradable materials like bamboo — reframes a creature most dismiss as a pest as a free, abundant ally for composters across Europe, the US, South America, and Australia, with one reader's countertop experiment showing how fast these crustaceans dismantle wood.
