Moray eels need water to run through their gills, and for that reason they keep opening and closing their mouths in a menacing way. Some divers interpret this as a threat, but moray eels are not aggressive (unless harassed).
Moray eels need water to run through their gills, and for that reason they keep opening and closing their mouths in a menacing way. Some divers interpret this as a threat, but moray eels are not aggressive (unless harassed).