Traces of ancient hormones were detected in the tusks of a woolly mammoth that lived more than 33,000 years ago, revealing that the now-extinct creatures had episodes of raging testosterone. The ...

Once a year, adult male Asian and African elephants go through musth, or a period when their reproductive hormone levels—including testosterone—surge, and they act more aggressive and unpredictable.

"Because musth is associated with dramatically elevated testosterone in modern elephants, it provides a starting point for assessing the feasibility of using hormones preserved in tusk growth records ...

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