fat sea biscuit
... that the fat sea biscuit covers its test during the day with pieces of plant and fragments of shell, holding them in place with its tube feet?
... that the <b id="mwBBI"><a href="./Clypeaster_rosaceus" id="mwBBM" rel="mw:WikiLink" title="Clypeaster rosaceus">fat sea biscuit</a></b> covers its <a href="./Test_(biology)" id="mwBBQ" rel="mw:WikiLink" title="Test (biology)">test</a> during the day with pieces of plant and fragments of shell, holding them in place with its tube feet?