grey reef shark
... that the grey reef shark is the first shark species known to perform a threat display to warn off divers who are too close?
... that the <b id="mwFC0"><a href="./Grey_reef_shark" id="mwFC4" rel="mw:WikiLink" title="Grey reef shark">grey reef shark</a></b> <i id="mwFC8">(pictured)</i> is the first shark species known to perform a <a class="mw-redirect" href="./Shark_threat_display" id="mwFDA" rel="mw:WikiLink" title="Shark threat display">threat display</a> to warn off <a class="mw-disambig" href="./Scuba" id="mwFDE" rel="mw:WikiLink" title="Scuba">divers</a> who are too close?