Moray eels have a second set of jaws in their throat called pharyngeal jaws, that also possess teeth. Moray eels are the only known type of animal that uses pharyngeal jaws to actively capture and restrain prey.
Actually, biologists say that morays are not agressive as it known, but shy and secretive, and they only attack humans in self-defense. They also accidentally bite human fingers when being fed, because it cannot see or hear very well, although they have an acute sense of smell!

And one more. If you want to have moray in your home aquarium, just remember, if you have hand been trapped into  moray’s mouth – the worst reaction is the most common and dangerous; to jerk your hand back in autonomic reaction, cutting yourself further on the recurved teeth and landscape. So be extremely careful.
Good night to all of you, sleep sweet )