The are a number of types of moray eels in the Caribbean. On this trip we have seen one huge Green Moray (sorry, no photo) and a few Spotted Moray. They like to hide in holes during the day with only their head sticking out. Some eels will hunt during the day and we have come across them out of their holes.
Their mouths are usually open as that is how they breathe. They pass water through their mouths past their gills. They look intimidating and ready to bite! Eels have two jaws with teeth on both, so you definitely do not want to get bitten!