Eels (Anguilliformes) are one order of fish Actinopterygii. People often mistakenly think that eels are snakes. Although shaped like snakes, eels are fish. They have gills instead of lungs like a snake. There are 600 species of true eels, ranging from moray, conger eels to snakes. The color is also various kinds, ranging from gray to yellow. Her body has no scales. Instead, their skin is covered by a mucous membrane. Eel secrete mucus to protect the body from parasites as well as lubricate muscles muscular. Eels do not have pectoral and pelvic fins. Even so, they have the anal and dorsal fins are long, which led to a short tail fin. Sense of vision is very bad, so eels rely more on smell. As a predator, eels have 27 teeth. Mandibular teeth only have one line, while the upper jaw has two rows of teeth. The trick is to attack their prey by hiding in a cave or under a concave section on the reef. Here he peered wait prey. At night time, the passing prey, and the eel was immediately caught with his mouth. He bites the prey to death. After that, the eel squeezes its prey with strong muscles. Prey being crushed and flattened. That eel muscle muscular function. To crush prey. After the crushed prey, then prey can get into the digestive tract. And he enjoyed the meal.