5. Hermaphrodite fish
No, that’s not a particular type of fish. Hermaphroditism, or possessing sex organs of both the male and female genders – occurs within a variety of species of fish. Whereas the condition almost always leads to infertility in birds and mammals, in fish it can be quite normal. A particular fish might have both male and female sex characteristics at once, or alternate them at different points in its lifetime according to environmental triggers. Wouldn’t it be nice to switch genders whenever a bad hair day or period cramps piss you off?