"When biologist Tyrone Hayes discovered that a top-selling herbicide [atrazine] messes with sex hormones, its manufacturer went into battle mode. Thus began one of the weirdest feuds in the history of science."

"Darnell lives deep in the basement of a life sciences building at the University of California-Berkeley, in a plastic tub on a row of stainless steel shelves. He is an African clawed frog, Xenopus laevis, sometimes called the lab rat of amphibians. Like most of his species, he's hardy and long-lived, an adept swimmer, a poor crawler, and a voracious eater. He's a good breeder, too, having produced both children and grandchildren. There is, however, one unusual thing about Darnell.

He's female."

Dashka Slater reports for Mother Jones in the January/February 2012 print issue. [2]