20) Humpback Anglerfish
Source: Imgur
The female of this species is a killing machine. The larger of the two, she has a bioluminescent lure dangling over her forehead which allows her to wait for prey to assault with rows of ferocious, spindly teeth. The male, meanwhile, is hunting her. Once he finds her, he latches on with hooked teeth and drains her blood while he fertilizes her eggs.