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Many reef fish, like the Clownfish , can change their biological sex based on social hierarchy. If the dominant female dies, the largest male will physically transform into a female to lead the group.

Found in the rainforests of New Guinea, the male Superb Bird-of-Paradise transforms its appearance entirely during courtship. It snaps its feathers into a jet-black cape, reveals a neon-green breast shield, and performs a highly coordinated dance around the female. Because females are highly selective, only the males with the most flawless execution and striking visual display get the chance to mate. 2. The Anglerfish: Extreme Symbiosis