The angler fish lives in one of the most uninhabitable habitats in the world- the lightless bottom of the sea. Living at depths of at least 2000m this species lives its life in the complete absence of sunlight. Some of them live in the sea floor while others live close to the sea floor.
The angler fish won’t impress you with good looks. For many species of angler fish, the males are much smaller than females. The females have a piece of dorsal spine that protrudes above their mouths like a fishing pole. In fact, they get their name because of this feature.
The tips of the spine have luminous flesh that attracts prey. Using a muscular skin flap, a deep-sea anglerfish can either hide or reveal its lighted lure. By pulsing the light and moving the lure back and forth, they successfully attract crustaceans, fishes, and other prey. Their bodies are flexible and mouths so big that they can swallow prey that is thrice their size.