have a look here:
http://marinebio.org/species.asp?id=106
http://www.montereybayaquarium.org/animal-guide/fishes/california-moray-eel
http://www.wired.com/2014/04/absurd-creature-of-the-week-this-eel-fires-extra-alien-jaws-out-of-its-throat/
A very good article about giant moray eels: http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.0040431
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