One species of anglerfish, the monkfish, may live more than 20 years. Anglerfish are known for their disproportionately large heads that comprise the bulk of their size. Many anglerfish species feature at least one long, worm-shaped appendage that functions as a lure to entice prey.
In certain species of deep sea anglerfish, bioluminescence can be deployed as another means of attracting prey. Once a target is within reach, the extreme size of the anglerfish's mouth allows it to devour its prey whole.
Anglerfish are sexually dimorphic, with males measuring only a fraction of the size of females. The males of some species are so small and undeveloped that they must attach themselves to females and act as parasites.