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This species lives within sea anemones in groups of two large fish and many small fish.
The two large fish are the only sexually mature fish and are a male and female breeding pair. If the large breeding female is removed, her male mate changes sex to female and the next largest fish in the group rapidly increases in size and takes over the role as the sexually mature male.
There, certain organisms change their reproductive identities or adapt the behavior of the opposite sex based on a time-specific need.
On rare occasions, the banana slug has been known to impregnate itself.
Even stranger, the banana slug has been observed gnawing off its partner’s penis after copulation. The jury is still out as to this actually happens: some believe it has to do with the fact that the organs get stuck, while others postulate that it has to do with sperm competition.
In matters of reproduction, the slugs simply look for a mate of similar size.
When they find one, the duo will form a small yellow yin-yang, insert their penises (located on their heads) and impregnate each other.