Blue-barred parrotfish have a sex change called sequential hermaphroditism, specifically protogyny. They are born female and, as they grow older or if the dominant male in the group disappears, the largest female changes into a male. This change isn’t just behavioral — it involves shifts in hormones, reproductive organs, coloration, and social role. The new male develops brighter colors (including the blue bars), becomes more territorial, and takes over mating duties. This strategy helps the gro
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