There is a fish called the blackspot angelfish, which can change from female to male. No, it cannot do it by simply wishing to become male. The change happens for a specific reason.
The angel fish live in groups. And each group has one male fish, which is blue in colour, and four female fish, which are yellow in colour.
The male angelfish is the strongest and largest member of the group. He is the one who protects and looks after the females and acts like their 'security guard'. When the male dies, the group needs a 'security guard'. This is when the largest female fish in the group begins to change its appearance.
She begins to grow larger in size. After a week, she starts changing colour, from yellow to blue. Slowly, her behaviour towards the females changes. She begins behaving like a male. Two weeks later, black stripes appear on her body. This indicates that the gender change is complete. She is now completely male!
This process of changing gender is called hermaphroditism. Amazing !!! Isn't it?
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