https://en.m.wikipedia.org/wiki/Anglerfish
>When scientists first started capturing ceratioid anglerfish, they noticed that all of the specimens were female. These individuals were a few centimetres in size and almost all of them had what appeared to be parasites attached to them. It turned out that these "parasites" were highly reduced male ceratioids.
>Thus, males never mature without attaching to a female, and die if they cannot find one.
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