Science: The Female Male

Word may not have filtered down to local chapters of Women's Lib, but a renegade group has been found among the ranks of Australian females. Both sexes of Labroides dimidiatus, an unprepossessing little fish of the wrasse family that lives in the waters of the Great Barrier Reef, are rampant male chauvinists. Not only do the males rule the reef, but the females like the idea so much that they turn into males themselves at the first opportunity.

After careful observation of many groups of wrasse, D.R. Robertson, a zoologist at the University of...

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