When frog gender flips

With weed killer in the water, some males acquire female traits.

By Stephen Ornes, 00:00 AM March 23, 2010

Several months ago, a California college student working at a university laboratory checked up on a group of frogs. And she witnessed an unusual behavior. Some frogs were acting like females. And that was unusual, because when the experiment began, all of the frogs had been males.


The student, Ngoc Mai Nguyen, says she told her boss: “I don’t know what’s going on, but I don’t think this is normal.” Nguyen is a student at the University of California, Berkeley. She was working in the laborator...

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