<a href="https://en.wikipedia.org/wiki/Moray_eel" class="extiw" title="w:Moray eel">Moray eels</a> have two sets of jaws: 1) the oral jaws that capture prey; and 2) the <a href="https://en.wikipedia.org/wiki/pharyngeal_jaws" class="extiw" title="w:pharyngeal jaws">pharyngeal jaws</a> (similar to the jaws of the monster in the movie <i>Alien</i>) that advance into the mouth and move prey from the oral jaws to the oesophagus for swallowing.
Zina Deretsky, National Science Foundation (after Rita Mehta, UC Davis); Ryan Wilson (<a href="//commons.wikimedia.org/wiki/User:Pbroks13" title="User:Pbroks13">pbroks13</a>)
CC BY 3.0
<a href="//commons.wikimedia.org/wiki/File:Pharyngeal_jaws_of_moray_eels.jpg" title="File:Pharyngeal jaws of moray eels.jpg">Pharyngeal jaws of moray eels.jpg</a>, which is in turn from <a rel="nofollow" class="external free" href="http://www.nsf.gov/news/news_images.jsp?cntn_id=109985&amp;org=NSF">http://www.nsf.gov/news/news_images.jsp?cntn_id=109985&amp;org=NSF</a>