Warning sign for Man-O-War (<i>Physalia physalis</i>)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/30412942@N00">Mike Johnston</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/30412942@N00/187500522">Man-O-War</a>