frilled dogwinkle
... that in the presence of red rock crabs, the shell of the frilled dogwinkle tends to grow thicker, whereas when predatory starfish are around, it tends to grow longer?
... that in the presence of <a href="./Cancer_productus" id="mwBlI" rel="mw:WikiLink" title="Cancer productus">red rock crabs</a>, the shell of the <b id="mwBlM"><a href="./Nucella_lamellosa" id="mwBlQ" rel="mw:WikiLink" title="Nucella lamellosa">frilled dogwinkle</a></b> tends to grow thicker, whereas when <a href="./Pisaster_ochraceus" id="mwBlU" rel="mw:WikiLink" title="Pisaster ochraceus">predatory starfish</a> are around, it tends to grow longer?