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  • Could The Pill be Killing our Fish? Oct. 17, 2014 7:34 PM Every day in Canada, estrogen, from millions of birth control pills, is flushed down the toilet and into our rivers and lakes. And according to a new Canadian study, it could be killing our fresh water fish. Researchers put estrogen into an experimental lake, and it led to the near-extinction of the fathead minnows.