Hagfish
Hagfish are usually about half a meter (18 in) long. They have long, eel-like bodies. Hagfish's eyes are small and not very useful, because the hagfish uses mostly its senses of smell and touch to find food. The whiskers near the hagfish's mouth are called barbels, and are used for touching. They have four hearts, two brains, and no backbone. A fish which looks like the hagfish is the lamprey.