Eels are elongated, snake-like fish that belong to the order Anguilliformes. They are found in both freshwater and saltwater environments around the world. Eels have smooth, slimy skin and can vary in size, with some species growing over 13 feet long. They are known for their unique life cycle, which often includes migrating long distances to spawn in specific locations, such as the Sargasso Sea. There are many different species of eels, including the well-known European eel and American eel. Eels are carnivorous and primarily feed on small fish, crustaceans, and invertebrates. They play an important role in their ecosystems as both predators and prey.