Anglerfish are small, predatory fish. They have one or more long, thin, flexible spines on their heads with a fleshy lump at the end. They can move this spine around and dangle the lump like bait in front of their mouths. Anglerfish are fairly rare and have an unusual way of reproducing. Male anglerfish are much smaller than females, and when they are mature they bite onto a female and then wither away to nothing but reproductive organs. They live like parasites on the female's bloodstream.