Armadillidium vulgare
... that the pill bug Armadillidium vulgare can reach population densities of 10,000 per square metre?
... that the <a href="./Armadillidiidae" id="mwBk4" rel="mw:WikiLink" title="Armadillidiidae">pill bug</a> <i id="mwBk8"><b id="mwBlA"><a href="./Armadillidium_vulgare" id="mwBlE" rel="mw:WikiLink" title="Armadillidium vulgare">Armadillidium vulgare</a></b></i> can reach <a href="./Population_density" id="mwBlI" rel="mw:WikiLink" title="Population density">population densities</a> of 10,000 per square metre?