burrowing brittle star
... that the burrowing brittle star submerges itself in mud and raises its arms to feed?
... that the <b id="mwAXk"><a href="./Amphiodia_urtica" id="mwAXo" rel="mw:WikiLink" title="Amphiodia urtica">burrowing brittle star</a></b> submerges itself in mud and raises its arms to feed?