Sex Changes in Clownfish


Clownfish live together in small groups with one large female fish and one or several smaller males. The smaller males cater for all the needs of the females and are eventually rewarded with the permission to fertilize her eggs. All clownfish are born male. They only have an opportunity to become female once the female in their group dies: The largest of the males undergoes a sex change and gets promoted to be the next female.

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