Threat display of a grey reef shark. The postures become more exaggerated as the danger perceived by the shark increases.
<a href="//commons.wikimedia.org/wiki/User:%D8%B9%D9%84%D8%A7%D8%A1" title="User:علاء">علاء</a>
2020-06-11
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Shark_threat_display.svg" title="File:Shark threat display.svg">Shark threat display.svg</a> <i>by</i> <a href="//commons.wikimedia.org/wiki/User:Chris_huh" title="User:Chris huh">Chris huh</a>