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Letter to Secretary Azar on the Scientific Understanding of Sex and Gender

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As scientists, the Joint Societies write to express our concerns about the attempt by the Department of Health and Human Services (HHS) to claim that there is a biological basis to defining gender as a strictly binary trait (male/female) determined by genitalia at birth.

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Why I Am a Naturalist

Madeleine Beekman

Madeleine Beekman

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  • The University of Sydney, Professor of Behavioural Ecology and Evolutionary Biology
  • Associate Editor, American Naturalist
Erol Akçay

Erol Akçay

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  • Department of Biollogy, University of Pennsylvania
  • Associate Editor, American Naturalist