Oh, man. Nature gives us another reason to be terrified of moray eels. They’re just like the alien that stalked Sigourney Weaver:
Like the fearsome extraterrestrial from the sci-fi horror classic Alien, these real-life beasts have a second, extendable pair of jaws — encrusted with sharp teeth — that thrusts forward to ensnare hapless fish and shrimp.
High-speed videos and X-ray photos (above) show how the second jaws, called pharyngeal jaws, lie in wait inside the throat, and then extend forwards into the mouth to grab prey that has been captured by the eel’s main teeth.
Check the x-ray pictures and video at the link.