doubleband surgeonfish
... that the doubleband surgeonfish can turn a dark brown shade flushed with red or violet when stressed?
... that the <b id="mwpg"><a href="./Doubleband_surgeonfish" id="mwpw" rel="mw:WikiLink" title="Doubleband surgeonfish">doubleband surgeonfish</a></b> <i id="mwqA">(example pictured)</i> can turn a dark brown shade flushed with red or violet when stressed?