Jackie Cooper, a curator at the National Aquarium in Baltimore, grew excited when she located the clownfish — made famous as the central character in the animated film “Finding Nemo” — swimming in the facility’s enormous blacktip reef tank.
“With clownfish, they’re all born gender-neutral,” she told the assembled parents and children. “When a spot opens up, one turns female … that’s the dominant one. If a female’s lost, one of the males will turn into a female to take its place. Wrasses do the same thing, but the male gender is dominant to female in that family.”
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