Moray eels are elongated fish with a serpent-like body, and a single fin that runs along most of the upper and lower length of the body, combining the dorsal, caudal (tail) and anal fins into a single seamless structure.
Moray eels have a distinctive feature called a pharyngeal jaw, which is a second inner jaw located further back in their mouth, complete with its own set of teeth. This jaw extends when the eels feeds to help it grip its prey.
Moray eels come in many different sizes and colors. One of the largest is the green moray, which can grow up to 8 feet in length. Like other moray eel species, it has a protective layer of mucus over its skin, rather than the scales of most fish. In the case of the green moray, this yellow mucus covers its brown body and combines to produce the green color that gives the species its common name.