Poecilochaetus serpens
... that the polychaete worm Poecilochaetus serpens digs a burrow with its head and lines it with particles of clay or mud cemented with mucus?
... that the <a href="./Polychaete" id="mwBGs" rel="mw:WikiLink" title="Polychaete">polychaete</a> worm <i id="mwBGw"><b id="mwBG0"><a href="./Poecilochaetus_serpens" id="mwBG4" rel="mw:WikiLink" title="Poecilochaetus serpens">Poecilochaetus serpens</a></b></i> digs a burrow with its head and lines it with particles of clay or mud cemented with mucus?