Woolly mammoths had testosterone-driven aggression during ma

The first direct evidence of musth, a testosterone-driven episode of heightened aggression against rival males, in adult male woolly mammoths. 

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United States , Michigan , America , Michael Cherney , Mike Cherney , Perrin Selcer , Daniel Fisher , Environmental Sciences , University Of Michigan , Um Museum Of Paleontology , Um Department Of History , Department Of Earth , Zum Museum , Um Medical , Professor Rich Auchus , Um Department , North America ,