Moray eels, also called Muraenidae are establish in shallow tropical and subtropical seas. They resemble snakes, their skin is without scales and depending on the type they are between 14cm and 4m long. The tropical moray species are often brightly patterned or bright. Muraenidae live in caves, crevices or coral reefs and are usually hunt only at night. A few species are poisonous. A characteristic feature of moray eels is, in addition to their eel-like body, the 4 nostrils, 2 of which can be found at the tip of the snout and 2 on the front edges of the eyes.