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Six-week-old spotted hyena. The provision of circulating androgens to both male and female spotted hyenas in utero may account for the masculinized genitalia of the females of this species and may potentially facilitate the intense aggression between littermates that occurs at birth. See page 1929. [Photo: R. DeFrancesco]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)