Black slug
...that the Black slug is the only species of slug that when disturbed contracts into a hemispherical shape and starts rocking from side to side to confuse predators?
...that the <b id="mwB3I"><a href="./Black_slug" id="mwB3M" rel="mw:WikiLink" title="Black slug">Black slug</a></b> is the only species of <a href="./Slug" id="mwB3Q" rel="mw:WikiLink" title="Slug">slug</a> that when disturbed contracts into a hemispherical shape and starts rocking from side to side to confuse predators?